Transimpedance Amplifier Circuit




The transimpedance op amp circuit configuration converts an input current source into an output voltage. The current to voltage gain is based on the feedback resistance. The circuit is able to maintain a constant voltage bias across the input source as the input current changes which benefits many sensors.

  • Uses a JFET or CMOS input op amp with low bias current to reduce DC errors
  • A bias voltage can be added to the non-inverting input to set the output
  • Operates within the linear output voltage swing (see Aol specification) to minimize non-linearity errors

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Design tool

Transimpedance Amplifier Circuit SBOMAK6.ZIP (9KB)

Supported products & hardware

Supported products & hardware

General-purpose op amps
OPA170 Single, 36-V, 1.2-MHz, low-power operational amplifier
MSP430 microcontrollers
MSP430FR2310 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Evaluation board
DIYAMP-EVM Universal do-it-yourself (DIY) amplifier circuit evaluation module

Technical documentation

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Type Title Date
* Circuit design Transimpedance amplifier circuit with MSP430 smart analog combo (Rev. A) PDF | HTML 06 Mar 2020
* Circuit design Transimpedance amplifier circuit. (Rev. A) 01 Feb 2019
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Technical article Transimpedance amplifier designs for high-performance, cost-sensitive smoke detector applications 10 Aug 2017
Application note Transimpedance Amplifiers (TIA): Choosing the Best Amplifier for the job (Rev. A) 16 May 2017
Technical article Designing high-performance, cost-sensitive transimpedance op-amp circuits 20 Jun 2016
Technical article Part III - What op amp bandwidth do I need? (Transimpedance Amplifiers) 08 May 2014
Technical article Part II - What op amp bandwidth do I need? (Transimpedance Amplifiers) 07 May 2014
Analog Design Journal 4Q 2012 Issue Analog Applications Journal 25 Sep 2012

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

Reference designs

TIDA-01350 High Speed, Linear Transimpedance Reference Design TIPD176 1 MHz, Single-Supply, Photodiode Amplifier Reference Design

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