
5.Reference
.pdf
90 |
CHAPTER 7. |
USING THE SPICE CIRCUIT SIMULATION PROGRAM |
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4.400E+00 |
6.141E-02 * |
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4.500E+00 |
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4.600E+00 |
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4.700E+00 |
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7.8.12Common-source JFET ampli¯er with self-bias
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10 kΩ |
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Rdrain |
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20 V |
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Vin |
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Vout |
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60 Hz |
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1 kΩ |
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Netlist: |
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common source jfet amplifier |
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vin 1 0 sin(0 1 60 0 0) |
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vdd 3 0 dc 20 |
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rdrain 3 2 10k |
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rsource 4 0 1k |
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j1 2 1 4 mod1 |
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.model mod1 njf |
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.tran 1m 30m |
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.plot tran v(2,0) v(1,0) |
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.end |
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Output: |
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legend: |
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*: v(2) |
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+: v(1) |
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time |
v(2) |
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(*)--------- 1.400E+01 |
1.600E+01 |
1.800E+01 |
2.000E+01 2.200E+01 |
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(+)--------- -1.000E+00 |
-5.000E-01 |
0.000E+00 |
5.000E-01 1.000E+00 |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

7.8. EXAMPLE CIRCUITS AND NETLISTS |
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91 |
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0.000E+00 |
1.708E+01 . |
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1.000E-03 |
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2.000E-03 |
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3.000E-03 |
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7.000E-03 |
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8.000E-03 |
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9.000E-03 |
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1.000E-02 |
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1.100E-02 |
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1.200E-02 |
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1.300E-02 |
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1.400E-02 |
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7.8.13Inverting op-amp circuit
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R2 |
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R1 |
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1.18 kΩ |
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3.29 kΩ |
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V1 |
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0 to 3.5 V |
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92 |
CHAPTER 7. USING THE SPICE CIRCUIT SIMULATION PROGRAM |
To simulate an ideal operational ampli¯er in SPICE, we use a voltage-dependent voltage source as a di®erential ampli¯er with extremely high gain. The "e" card sets up the dependent voltage source with four nodes, 3 and 0 for voltage output, and 1 and 0 for voltage input. No power supply is needed for the dependent voltage source, unlike a real operational ampli¯er. The voltage gain is set at 999,000 in this case. The input voltage source (V1) sweeps from 0 to 3.5 volts in 0.05 volt steps.
Netlist: |
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Inverting |
opamp |
v1 2 0 dc |
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e 3 0 0 1 |
999k |
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3.29k |
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1.18k |
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.dc v1 0 3.5 |
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.print dc v(3,0) |
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.end |
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Output: |
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v1 |
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v(3) |
0.000E+00 |
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5.000E-02 |
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1.000E-01 |
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1.500E-01 |
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2.000E-01 |
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2.500E-01 |
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3.000E-01 |
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3.500E-01 |
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4.000E-01 |
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4.500E-01 |
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5.000E-01 |
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5.500E-01 |
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6.000E-01 |
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6.500E-01 |
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7.000E-01 |
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7.500E-01 |
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8.000E-01 |
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8.500E-01 |
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9.500E-01 |
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1.000E+00 |
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1.050E+00 |
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1.100E+00 |
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1.150E+00 |
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1.200E+00 |
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1.250E+00 |
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1.300E+00 |
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7.8. EXAMPLE CIRCUITS AND NETLISTS |
93 |
1.350E+00 -3.764E+00
1.400E+00 -3.903E+00
1.450E+00 -4.043E+00
1.500E+00 -4.182E+00
1.550E+00 -4.322E+00
1.600E+00 -4.461E+00
1.650E+00 -4.600E+00
1.700E+00 -4.740E+00
1.750E+00 -4.879E+00
1.800E+00 -5.019E+00
1.850E+00 -5.158E+00
1.900E+00 -5.297E+00
1.950E+00 -5.437E+00
2.000E+00 -5.576E+00
2.050E+00 -5.716E+00
2.100E+00 -5.855E+00
2.150E+00 -5.994E+00
2.200E+00 -6.134E+00
2.250E+00 -6.273E+00
2.300E+00 -6.413E+00
2.350E+00 -6.552E+00
2.400E+00 -6.692E+00
2.450E+00 -6.831E+00
2.500E+00 -6.970E+00
2.550E+00 -7.110E+00
2.600E+00 -7.249E+00
2.650E+00 -7.389E+00
2.700E+00 -7.528E+00
2.750E+00 -7.667E+00
2.800E+00 -7.807E+00
2.850E+00 -7.946E+00
2.900E+00 -8.086E+00
2.950E+00 -8.225E+00
3.000E+00 -8.364E+00
3.050E+00 -8.504E+00
3.100E+00 -8.643E+00
3.150E+00 -8.783E+00
3.200E+00 -8.922E+00
3.250E+00 -9.061E+00
3.300E+00 -9.201E+00
3.350E+00 -9.340E+00
3.400E+00 -9.480E+00
3.450E+00 -9.619E+00
3.500E+00 -9.758E+00

94 |
CHAPTER 7. USING THE SPICE CIRCUIT SIMULATION PROGRAM |
7.8.14Noninverting op-amp circuit
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Another example of a SPICE quirk: since the dependent voltage source "e" isn't considered a load to voltage source V1, SPICE interprets V1 to be open-circuited and will refuse to analyze it.
The ¯x is to connect Rbogus in parallel with V1 to act as a DC load. Being directly connected across V1, the resistance of Rbogus is not crucial to the operation of the circuit, so 10 k- will work ¯ne. I decided not to sweep the V1 input voltage at all in this circuit for the sake of keeping the netlist
and output listing simple.
Netlist:
noninverting opamp v1 2 0 dc 5 rbogus 2 0 10k
e 3 0 2 1 999k r1 3 1 20k
r2 1 0 10k
.end
Output: |
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node |
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voltage |
node |
voltage |
( 1) |
5.0000 |
( 2) |
5.0000 |
( 3) |
15.0000 |

7.8. EXAMPLE CIRCUITS AND NETLISTS |
95 |
7.8.15Instrumentation ampli¯er
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Rbogus1 |
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0 to 10 V |
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10 kΩ |
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Rgain |
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10 kΩ |
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Rbogus2 |
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Note the very high-resistance Rbogus1 and Rbogus2 resistors in the netlist (not shown in schematic for brevity) across each input voltage source, to keep SPICE from thinking V1 and V2 were open-
circuited, just like the other op-amp circuit examples.
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Netlist: |
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Instrumentation amplifier |
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v1 |
1 |
0 |
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rbogus1 1 |
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0 |
9e12 |
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v2 |
4 |
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dc |
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rbogus2 4 |
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9e12 |
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e1 |
3 |
0 |
1 |
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999k |
e2 |
6 |
0 |
4 |
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999k |
e3 |
9 |
0 |
8 |
7 |
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999k |
rload 9 0 |
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10k |
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r1 |
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10k |
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rgain 2 5 |
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10k |
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r3 |
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10k |
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r4 |
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10k |
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r5 |
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r6 |
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10k |
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.dc v1 |
0 10 |
1 |
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dc |
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v(9) v(3,6) |
.end |
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Output: |
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v1 |
v(9) |
v(3,6) |

96 |
CHAPTER 7. USING THE SPICE CIRCUIT SIMULATION PROGRAM |
0.000E+00 1.500E+01 -1.500E+01
1.000E+00 1.200E+01 -1.200E+01
2.000E+00 9.000E+00 -9.000E+00
3.000E+00 6.000E+00 -6.000E+00
4.000E+00 3.000E+00 -3.000E+00
5.000E+00 9.955E-11 -9.956E-11
6.000E+00 -3.000E+00 3.000E+00
7.000E+00 -6.000E+00 6.000E+00
8.000E+00 -9.000E+00 9.000E+00
9.000E+00 -1.200E+01 1.200E+01
1.000E+01 -1.500E+01 1.500E+01
7.8.16Op-amp integrator with sinewave input
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1 |
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R1 |
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C1 |
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10 kΩ |
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2 |
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− |
100 μF |
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Vin |
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15 V |
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60 Hz |
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(e) |
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Vout |
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Netlist: |
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Integrator with sinewave input |
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vin 1 0 sin (0 15 60 0 0) |
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r1 |
1 |
2 |
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10k |
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c1 2 3 150u ic=0 |
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e 3 0 0 2 999k |
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.tran 1m 30m uic
.plot tran v(1,0) v(3,0)
.end
Output:
legend: |
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*: |
v(1) |
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+: |
v(3) |
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time |
v(1) |
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(*)-------- |
-2.000E+01 |
-1.000E+01 |
0.000E+00 |
1.000E+01 |
7.8. EXAMPLE CIRCUITS AND NETLISTS |
|
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97 |
||||||
(+)-------- -6.000E-02 |
|
-4.000E-02 |
-2.000E-02 |
0.000E+00 |
|||||||
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
|||||||||||
0.000E+00 |
6.536E-08 . |
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* |
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+ |
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1.000E-03 |
5.516E+00 . |
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+. |
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2.000E-03 |
1.021E+01 . |
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* |
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3.000E-03 |
1.350E+01 . |
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+ |
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* . |
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4.000E-03 |
1.495E+01 . |
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+ . |
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*. |
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5.000E-03 |
1.418E+01 . |
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+ |
. |
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* . |
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6.000E-03 |
1.150E+01 . |
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+ . |
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. * |
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7.000E-03 |
7.214E+00 |
. + |
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* |
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8.000E-03 |
1.867E+00 |
.+ |
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* |
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9.000E-03 -3.709E+00 |
. + |
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* |
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1.000E-02 -8.805E+00 |
. |
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1.100E-02 -1.259E+01 . |
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+ |
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1.200E-02 -1.466E+01 |
. * |
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+ |
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1.300E-02 -1.471E+01 |
. * |
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+. |
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1.400E-02 -1.259E+01 . |
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* |
. |
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+ |
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. |
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1.500E-02 -8.774E+00 . |
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. * |
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+ |
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1.600E-02 -3.723E+00 . |
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* |
. |
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+. |
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1.700E-02 |
1.870E+00 . |
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* |
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+ |
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1.800E-02 |
7.188E+00 . |
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* + . |
. |
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1.900E-02 |
1.154E+01 . |
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. |
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+ |
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. * |
. |
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2.000E-02 |
1.418E+01 . |
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.+ |
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* . |
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2.100E-02 |
1.490E+01 . |
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+ |
. |
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*. |
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2.200E-02 |
1.355E+01 . |
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* . |
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2.300E-02 |
1.020E+01 . |
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* |
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2.400E-02 |
5.496E+00 |
. + |
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* |
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. |
2.500E-02 -1.486E-03 |
.+ |
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* |
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2.600E-02 -5.489E+00 |
. + |
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* |
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2.700E-02 -1.021E+01 . |
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+ |
* |
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2.800E-02 -1.355E+01 |
. |
* |
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2.900E-02 -1.488E+01 |
. * |
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+ |
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3.000E-02 -1.427E+01 |
. |
* |
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.+ |
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. |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

98 |
CHAPTER 7. USING THE SPICE CIRCUIT SIMULATION PROGRAM |
7.8.17Op-amp integrator with squarewave input
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1 |
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R1 |
2 |
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C1 |
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3 |
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10 kΩ |
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100 μF |
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Vin |
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1 V |
2 |
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50 Hz |
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(e) |
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Netlist: |
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||||||
Integrator with squarewave input |
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vin 1 0 pulse (-1 1 0 0 0 10m 20m) |
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r1 |
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1k |
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c1 2 3 150u ic=0 |
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e 3 0 0 2 |
999k |
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.tran 1m 50m uic |
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.plot tran |
v(1,0) v(3,0) |
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.end |
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Output: |
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legend: |
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*: v(1) |
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+: v(3) |
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time |
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v(1) |
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(*)-------- -1.000E+00 |
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-5.000E-01 |
0.000E+00 |
5.000E-01 |
1.000E+00 |
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(+)-------- -1.000E-01 |
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-5.000E-02 |
0.000E+00 |
5.000E-02 |
1.000E-01 |
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
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0.000E+00 |
-1.000E+00 * |
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. |
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+ |
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. |
. |
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1.000E-03 |
1.000E+00 . |
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. |
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+ |
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. |
* |
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2.000E-03 |
1.000E+00 . |
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. |
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+ . |
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. |
* |
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3.000E-03 |
1.000E+00 . |
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. |
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+ |
. |
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. |
* |
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4.000E-03 |
1.000E+00 . |
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. |
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+ |
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. |
* |
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5.000E-03 |
1.000E+00 . |
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. |
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+ |
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. |
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. |
* |
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6.000E-03 |
1.000E+00 . |
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. |
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+ |
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. |
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. |
* |
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7.000E-03 |
1.000E+00 . |
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. |
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+ |
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. |
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. |
* |
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8.000E-03 |
1.000E+00 . |
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.+ |
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. |
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. |
* |
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9.000E-03 |
1.000E+00 . |
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+. |
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. |
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. |
* |
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1.000E-02 |
1.000E+00 . |
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+ . |
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. |
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. |
* |
7.8. EXAMPLE CIRCUITS AND NETLISTS |
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99 |
|||||
1.100E-02 |
1.000E+00 . |
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+ |
. |
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. |
. |
* |
1.200E-02 -1.000E+00 * |
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+ |
. |
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. |
. |
. |
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1.300E-02 -1.000E+00 * |
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+ . |
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. |
. |
. |
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1.400E-02 -1.000E+00 * |
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+. |
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. |
. |
. |
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1.500E-02 -1.000E+00 * |
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.+ |
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. |
. |
. |
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1.600E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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1.700E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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1.800E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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1.900E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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2.000E-02 -1.000E+00 * |
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. |
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+ |
. |
. |
. |
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2.100E-02 |
1.000E+00 . |
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. |
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+ |
. |
. |
* |
2.200E-02 |
1.000E+00 . |
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. |
+ |
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. |
. |
* |
2.300E-02 |
1.000E+00 . |
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. |
+ |
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. |
. |
* |
2.400E-02 |
1.000E+00 . |
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. |
+ |
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. |
. |
* |
2.500E-02 |
1.000E+00 . |
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. |
+ |
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. |
. |
* |
2.600E-02 |
1.000E+00 . |
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.+ |
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. |
. |
* |
2.700E-02 |
1.000E+00 . |
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+. |
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. |
. |
* |
2.800E-02 |
1.000E+00 . |
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+ . |
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. |
. |
* |
2.900E-02 |
1.000E+00 . |
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+ |
. |
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. |
. |
* |
3.000E-02 |
1.000E+00 . |
+ |
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. |
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. |
. |
* |
3.100E-02 |
1.000E+00 . + |
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. |
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. |
. |
* |
3.200E-02 -1.000E+00 * + |
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. |
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. |
. |
. |
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3.300E-02 -1.000E+00 * |
+ |
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. |
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. |
. |
. |
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3.400E-02 -1.000E+00 * |
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+ |
. |
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. |
. |
. |
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3.500E-02 -1.000E+00 * |
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+ . |
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. |
. |
. |
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3.600E-02 -1.000E+00 * |
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+. |
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. |
. |
. |
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3.700E-02 -1.000E+00 * |
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.+ |
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. |
. |
. |
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3.800E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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3.900E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
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4.000E-02 -1.000E+00 * |
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. |
+ |
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. |
. |
. |
|
4.100E-02 |
1.000E+00 . |
|
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. |
+ |
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. |
. |
* |
4.200E-02 |
1.000E+00 . |
|
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. |
+ |
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. |
. |
* |
4.300E-02 |
1.000E+00 . |
|
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. |
+ |
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. |
. |
* |
4.400E-02 |
1.000E+00 . |
|
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.+ |
|
|
. |
. |
* |
4.500E-02 |
1.000E+00 . |
|
|
+. |
|
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. |
. |
* |
4.600E-02 |
1.000E+00 . |
|
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+ . |
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. |
. |
* |
4.700E-02 |
1.000E+00 . |
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+ |
. |
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. |
. |
* |
4.800E-02 |
1.000E+00 . |
+ |
|
. |
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. |
. |
* |
4.900E-02 |
1.000E+00 . + |
|
|
. |
|
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. |
. |
* |
5.000E-02 |
1.000E+00 + |
|
|
. |
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. |
. |
* |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -