CIRCUIT060041
AC-coupled transimpedance amplifier circuit
CIRCUIT060041
Overview
This circuit uses an op amp configured as a transimpedance amplifier to amplify the AC signal of a photodiode (modeled by Ii and C3). The circuit rejects DC signals using a transistor to sink DC current out of the photodiode through the use of an integrator in a servo loop. The bias voltage applied to the non-inverting input prevents the output from saturating to the negative supply rail in the absence of input current.
Features
- Input current Ii = -10 µA to 10 µA
- Ambient light current = 100 µA
- Output voltage: Vo = 0.5 V to 4.5 V
- Target bandwith = 300 kHz
- Supply:
- Vcc = 5 V
- Vee = 0 V
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Circuit design | AC-Coupled Transimpedance Amplifier Circuit (Rev. A) | PDF | HTML | Jan 27, 2025 | |
| Application brief | Simplify Transimpedance Applications with High-bandwidth, Precision JFET Op Amps | May 21, 2019 | ||
| Application note | Nano-Power Transimpedance Amplifier for Current Output Sensors | Mar 7, 2018 | ||
| Application note | Transimpedance Amplifiers (TIA): Choosing the Best Amplifier for the job (Rev. A) | May 16, 2017 | ||
| User guide | 1-MHz Single-Supply Photodiode Amplifier Reference Design Guide | Sep 16, 2014 |