AC-coupled transimpedance amplifier circuit



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.
  • 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
General-purpose op amps
OPA172 Single, 36-V, 10-MHz, low-power operational amplifier OPA2991 Dual, 40-V, 4.5-MHz, low-power operational amplifier TLV9042 Dual, 5.5-V, 350-kHz, Ultra-low 1.2-V, low quiescent current (10-μA) op amp
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Technical documentation

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Type Title Date
* Circuit design AC-coupled transimpedance amplifier circuit PDF | HTML 13 May 2021
Application brief Simplify Transimpedance Applications with High-bandwidth, Precision JFET Op Amps 21 May 2019
Application note Nano-Power Transimpedance Amplifier for Current Output Sensors 07 Mar 2018
Application note Transimpedance Amplifiers (TIA): Choosing the Best Amplifier for the job (Rev. A) 16 May 2017
User guide 1-MHz Single-Supply Photodiode Amplifier Reference Design Guide 16 Sep 2014

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