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THS4631 |
SLOS451C – DECEMBER 2004 – REVISED MARCH 2025 |
Table 8-1. Transimpedance Performance Summary for Various Configurations
SOURCE |
TRANSIMPEDANCE |
FEEDBACK |
–3dB |
CAPACITANCE (PF) |
GAIN (Ω) |
CAPACITANCE (PF) |
FREQUENCY (MHZ) |
18 |
10k |
2 |
15.8 |
|
|
|
|
18 |
100k |
0.5 |
3 |
|
|
|
|
18 |
1M |
0 |
1.2 |
|
|
|
|
47 |
10k |
2.2 |
8.4 |
|
|
|
|
47 |
100k |
0.7 |
2.1 |
|
|
|
|
47 |
1M |
0.2 |
0.52 |
|
|
|
|
100 |
10k |
3 |
5.5 |
|
|
|
|
100 |
100k |
1 |
1.4 |
|
|
|
|
100 |
1M |
0.2 |
0.37 |
|
|
|
|
8.2.1.2 Application Curves
|
85 |
|
|
|
|
|
|
|
|
CS = 18 PF |
|
− dB |
|
|
|
CF = 2 PF |
|
80 |
|
|
|
|
|
Gain |
|
CS = 47 PF |
|
|
|
Transimpedance |
|
|
|
||
|
CF = 2.2 PF |
|
|
||
75 |
|
|
|
|
|
|
CS = 100 PF |
|
|
||
|
CF = 3 PF |
|
|
||
70 |
|
|
|
|
|
VS = ±15 V |
|
|
|
||
|
|
|
|
||
|
RL = 1 K |
|
|
|
|
|
RF = 10 K |
|
|
|
|
|
65 |
|
|
|
|
|
10 K |
100 K |
1 M |
10 M |
1 G |
|
|
f − Frequency − Hz |
|
||
Figure 8-6. 10kΩ Transimpedance Responses
|
105 |
|
|
|
|
dB |
|
|
|
CS = 18 PF |
|
|
|
|
CF = 0.5 PF |
|
|
− |
100 |
|
|
|
|
Gain |
|
|
|
|
|
Transimpedance |
|
CS = 47 PF |
|
|
|
95 |
CF = 0.7 PF |
|
|
|
|
|
CS = 100 PF |
|
|
|
|
|
CF = 1 PF |
|
|
|
|
90 |
|
|
|
|
|
VS = ±15 V |
|
|
|
||
|
|
|
|
||
|
RL = 1 K |
|
|
|
|
|
RF = 100 K |
|
|
|
|
|
85 |
|
|
|
|
|
10 K |
100 K |
1 M |
10 M |
1 G |
|
|
f − Frequency − Hz |
|
||
Figure 8-7. 100kΩ Transimpedance Responses
|
125 |
|
|
|
|
|
|
|
|
CS = 18 PF |
|
|
|
|
|
CF = 0 PF |
|
− dB |
120 |
|
|
|
|
|
|
|
|
|
|
Gain |
115 |
|
|
|
|
|
CS |
= 47 PF |
|
|
|
Transimpedance |
|
|
|
||
|
CF = 0.2 PF |
|
|
||
110 |
|
|
|
|
|
|
CS = 100 PF |
|
|
||
105 |
CF = 0.2 PF |
|
|
||
|
VS = ±15 V |
|
|
||
|
100 |
|
|
||
|
RL = 1 K |
|
|
|
|
|
|
|
|
|
|
|
|
RF = 1 M |
|
|
|
|
95 |
|
|
|
|
|
|
10 K |
100 K |
1 M |
10 M |
|
|
|
f − Frequency − Hz |
|
|
Figure 8-8. 1MΩ Transimpedance Responses
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