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Санкт-Петербургский государственный электротехнический университет "ЛЭТИ"

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Электротехника

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90	CHAPTER 7.		USING THE SPICE CIRCUIT SIMULATION PROGRAM
4.400E+00	6.141E-02 *		.	.	.
4.500E+00	5.657E-02 *		.	.	.
4.600E+00	5.281E-02 *		.	.	.
4.700E+00	4.981E-02	*	.	.	.
4.800E+00	4.734E-02	*	.	.	.
4.900E+00	4.525E-02	*	.	.	.
5.000E+00	4.346E-02	*	.	.	.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

7.8.12Common-source JFET ampli¯er with self-bias

10 kΩ

Rdrain

VDD

20 V

Vin

1 V

Vout

60 Hz

1 kΩ

Rsource

Netlist:

common source jfet amplifier

vin 1 0 sin(0 1 60 0 0)

vdd 3 0 dc 20

rdrain 3 2 10k

rsource 4 0 1k

j1 2 1 4 mod1

.model mod1 njf

.tran 1m 30m

.plot tran v(2,0) v(1,0)

.end

Output:

legend:

*: v(2)

+: v(1)

time

v(2)

(*)--------- 1.400E+01

1.600E+01

1.800E+01

2.000E+01 2.200E+01

(+)--------- -1.000E+00

-5.000E-01

0.000E+00

5.000E-01 1.000E+00

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

7.8. EXAMPLE CIRCUITS AND NETLISTS												91
0.000E+00	1.708E+01 .				.	*	+			.		.
1.000E-03	1.609E+01 .				.*		.			+ .		.
2.000E-03	1.516E+01 .			*	.		.			.	+	.
3.000E-03	1.448E+01	.	*		.		.			.		+ .
4.000E-03	1.419E+01	.*			.		.			.		+
5.000E-03	1.432E+01	. *			.		.			.		+.
6.000E-03	1.490E+01 .			*	.		.			.	+	.
7.000E-03	1.577E+01 .				* .		.			+.		.
8.000E-03	1.676E+01 .				.	*	.	+		.		.
9.000E-03	1.768E+01 .				.	+	*.			.		.
1.000E-02	1.841E+01 .				+ .		. *			.		.
1.100E-02	1.890E+01	.	+		.		.	*		.		.
1.200E-02	1.912E+01	.+			.		.		*	.		.
1.300E-02	1.912E+01	.+			.		.		*	.		.
1.400E-02	1.890E+01	.	+		.		.	*		.		.
1.500E-02	1.842E+01 .				+ .		. *			.		.
1.600E-02	1.768E+01 .				.	+	*.			.		.
1.700E-02	1.676E+01 .				.	*	.	+		.		.
1.800E-02	1.577E+01 .				* .		.			+.		.
1.900E-02	1.491E+01 .			*	.		.			.	+	.
2.000E-02	1.432E+01	. *			.		.			.		+.
2.100E-02	1.419E+01	.*			.		.			.		+
2.200E-02	1.449E+01	.	*		.		.			.		+ .
2.300E-02	1.516E+01 .			*	.		.			.	+	.
2.400E-02	1.609E+01 .				.*		.			+ .		.
2.500E-02	1.708E+01 .				.	*	+			.		.
2.600E-02	1.796E+01 .				. +		*			.		.
2.700E-02	1.861E+01 .				+ .		.	*		.		.
2.800E-02	1.900E+01	.	+		.		.		*	.		.
2.900E-02	1.916E+01	+			.		.		*	.		.
3.000E-02	1.908E+01	.+			.		.		*	.		.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

7.8.13Inverting op-amp circuit

	2		R2	1		R1	3
		1.18 kΩ			3.29 kΩ
V1		0 to 3.5 V		1	−		3




					(e)


0				0	+
0

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:
Inverting	opamp
v1 2 0 dc
e 3 0 0 1	999k

r1	3	1	3.29k
r2	1	2	1.18k
.dc v1 0 3.5				0.05
.print dc v(3,0)
.end
	Output:
v1				v(3)
0.000E+00				0.000E+00
5.000E-02				-1.394E-01
1.000E-01				-2.788E-01
1.500E-01				-4.182E-01
2.000E-01				-5.576E-01
2.500E-01				-6.970E-01
3.000E-01				-8.364E-01
3.500E-01				-9.758E-01
4.000E-01				-1.115E+00
4.500E-01				-1.255E+00
5.000E-01				-1.394E+00
5.500E-01				-1.533E+00
6.000E-01				-1.673E+00
6.500E-01				-1.812E+00
7.000E-01				-1.952E+00
7.500E-01				-2.091E+00
8.000E-01				-2.231E+00
8.500E-01				-2.370E+00
9.000E-01				-2.509E+00
9.500E-01				-2.649E+00
1.000E+00				-2.788E+00
1.050E+00				-2.928E+00
1.100E+00				-3.067E+00
1.150E+00				-3.206E+00
1.200E+00				-3.346E+00
1.250E+00				-3.485E+00
1.300E+00				-3.625E+00

7.8. EXAMPLE CIRCUITS AND NETLISTS

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

R2	1	R1	3
10 kΩ		20 kΩ

		1	−	3
		1	−
		2	(e)
			(e)
2			+

	10 kΩ
Rbogus		V1	5 V



0

		0

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:
node	voltage	node	voltage	node	voltage
( 1)	5.0000	( 2)	5.0000	( 3)	15.0000

7.8. EXAMPLE CIRCUITS AND NETLISTS

7.8.15Instrumentation ampli¯er

1	1											R3			R4
1							+		3			R3	7		R4		9
									(e1)
Rbogus1		V1				2		−	(e1)		10 kΩ			10 kΩ
					0 to 10 V						10 kΩ
										R1	10 kΩ
0	0										2		7	−


											10 kΩ						9

										Rgain				(e3)
										Rgain				(e3)
													8	+			10 kΩ
											5		8	+		Rload
											5					Rload
											10 kΩ
										R2
								−									0
																	0
				4		5			(e2)			R5			R6		0
						5			(e2)			R5			R6
4								+	6		10 kΩ		8	10 kΩ
Rbogus2			V2			5 V





0				0
0				0

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.

	Netlist:
Instrumentation amplifier
v1	1	0
rbogus1 1					0	9e12
v2	4	0	dc		5
rbogus2 4					0	9e12
e1	3	0	1	2		999k
e2	6	0	4	5		999k
e3	9	0	8	7		999k
rload 9 0					10k
r1	2	3	10k
rgain 2 5					10k
r2	5	6	10k
r3	3	7	10k
r4	7	9	10k
r5	6	8	10k
r6	8	0	10k
.dc v1			0 10			1
.print			dc		v(9) v(3,6)

.end
Output:
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

10 kΩ

−

100 μF

Vin

15 V

60 Hz

(e)

Vout

Netlist:

Integrator with sinewave input

vin 1 0 sin (0 15 60 0 0)

10k

c1 2 3 150u ic=0

e 3 0 0 2 999k

.tran 1m 30m uic

.plot tran v(1,0) v(3,0)

.end

Output:

legend:
*:	v(1)
+:	v(3)
time		v(1)
(*)--------		-2.000E+01	-1.000E+01	0.000E+00	1.000E+01

7.8. EXAMPLE CIRCUITS AND NETLISTS											97
(+)-------- -6.000E-02				-4.000E-02			-2.000E-02		0.000E+00
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
0.000E+00	6.536E-08 .				.		*			+	.
1.000E-03	5.516E+00 .				.		.		*	+.	.
2.000E-03	1.021E+01 .				.		.		+	*	.
3.000E-03	1.350E+01 .				.		.	+		.	* .
4.000E-03	1.495E+01 .				.		+ .			.	*.
5.000E-03	1.418E+01 .				.	+	.			.	* .
6.000E-03	1.150E+01 .				+ .		.			. *	.
7.000E-03	7.214E+00	. +			.		.		*	.	.
8.000E-03	1.867E+00	.+			.		.	*		.	.
9.000E-03 -3.709E+00		. +			.	*	.			.	.
1.000E-02 -8.805E+00		.	+		. *		.			.	.
1.100E-02 -1.259E+01 .				*	+		.			.	.
1.200E-02 -1.466E+01		. *			.	+	.			.	.
1.300E-02 -1.471E+01		. *			.		+.			.	.
1.400E-02 -1.259E+01 .				*	.		.	+		.	.
1.500E-02 -8.774E+00 .					. *		.		+	.	.
1.600E-02 -3.723E+00 .					.	*	.			+.	.
1.700E-02	1.870E+00 .				.		.	*		+	.
1.800E-02	7.188E+00 .				.		.		* + .		.
1.900E-02	1.154E+01 .				.		.	+		. *	.
2.000E-02	1.418E+01 .				.		.+			.	* .
2.100E-02	1.490E+01 .				.	+	.			.	*.
2.200E-02	1.355E+01 .				. +		.			.	* .
2.300E-02	1.020E+01 .			+	.		.			*	.
2.400E-02	5.496E+00	. +			.		.		*	.	.
2.500E-02 -1.486E-03		.+			.		*			.	.
2.600E-02 -5.489E+00		. +			.	*	.			.	.
2.700E-02 -1.021E+01 .				+	*		.			.	.
2.800E-02 -1.355E+01		.	*		. +		.			.	.
2.900E-02 -1.488E+01		. *			.	+	.			.	.
3.000E-02 -1.427E+01		.	*		.		.+			.	.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

98	CHAPTER 7. USING THE SPICE CIRCUIT SIMULATION PROGRAM

7.8.17Op-amp integrator with squarewave input

10 kΩ

100 μF

Vin

1 V

−

50 Hz

(e)

Vout

Netlist:

Integrator with squarewave input

vin 1 0 pulse (-1 1 0 0 0 10m 20m)

c1 2 3 150u ic=0

e 3 0 0 2

999k

.tran 1m 50m uic

.plot tran

v(1,0) v(3,0)

.end

Output:

legend:

*: v(1)

+: v(3)

time

v(1)

(*)-------- -1.000E+00

-5.000E-01

0.000E+00

5.000E-01

1.000E+00

(+)-------- -1.000E-01

-5.000E-02

0.000E+00

5.000E-02

1.000E-01

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

0.000E+00

-1.000E+00 *

1.000E-03

1.000E+00 .

2.000E-03

1.000E+00 .

+ .

3.000E-03

1.000E+00 .

4.000E-03

1.000E+00 .

5.000E-03

1.000E+00 .

6.000E-03

1.000E+00 .

7.000E-03

1.000E+00 .

8.000E-03

1.000E+00 .

9.000E-03

1.000E+00 .

1.000E-02

1.000E+00 .

+ .

7.8. EXAMPLE CIRCUITS AND NETLISTS									99
1.100E-02	1.000E+00 .		+	.			.	.	*
1.200E-02 -1.000E+00 *			+	.			.	.	.
1.300E-02 -1.000E+00 *				+ .			.	.	.
1.400E-02 -1.000E+00 *				+.			.	.	.
1.500E-02 -1.000E+00 *				.+			.	.	.
1.600E-02 -1.000E+00 *				.	+		.	.	.
1.700E-02 -1.000E+00 *				.	+		.	.	.
1.800E-02 -1.000E+00 *				.	+		.	.	.
1.900E-02 -1.000E+00 *				.	+		.	.	.
2.000E-02 -1.000E+00 *				.		+	.	.	.
2.100E-02	1.000E+00 .			.		+	.	.	*
2.200E-02	1.000E+00 .			.	+		.	.	*
2.300E-02	1.000E+00 .			.	+		.	.	*
2.400E-02	1.000E+00 .			.	+		.	.	*
2.500E-02	1.000E+00 .			.	+		.	.	*
2.600E-02	1.000E+00 .			.+			.	.	*
2.700E-02	1.000E+00 .			+.			.	.	*
2.800E-02	1.000E+00 .			+ .			.	.	*
2.900E-02	1.000E+00 .		+	.			.	.	*
3.000E-02	1.000E+00 .	+		.			.	.	*
3.100E-02	1.000E+00 . +			.			.	.	*
3.200E-02 -1.000E+00 * +				.			.	.	.
3.300E-02 -1.000E+00 *		+		.			.	.	.
3.400E-02 -1.000E+00 *			+	.			.	.	.
3.500E-02 -1.000E+00 *				+ .			.	.	.
3.600E-02 -1.000E+00 *				+.			.	.	.
3.700E-02 -1.000E+00 *				.+			.	.	.
3.800E-02 -1.000E+00 *				.	+		.	.	.
3.900E-02 -1.000E+00 *				.	+		.	.	.
4.000E-02 -1.000E+00 *				.	+		.	.	.
4.100E-02	1.000E+00 .			.	+		.	.	*
4.200E-02	1.000E+00 .			.	+		.	.	*
4.300E-02	1.000E+00 .			.	+		.	.	*
4.400E-02	1.000E+00 .			.+			.	.	*
4.500E-02	1.000E+00 .			+.			.	.	*
4.600E-02	1.000E+00 .			+ .			.	.	*
4.700E-02	1.000E+00 .		+	.			.	.	*
4.800E-02	1.000E+00 .	+		.			.	.	*
4.900E-02	1.000E+00 . +			.			.	.	*
5.000E-02	1.000E+00 +			.			.	.	*

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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