CIRCUIT0020

Transimpedance Amplifier Circuit

CIRCUIT0020

Overview

The transimpedance operational-amplifier 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.

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

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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
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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) PDF | HTML 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 detect PDF | HTML 10 Aug 2017
Application note Transimpedance Amplifiers (TIA): Choosing the Best Amplifier for the job (Rev. A) 16 May 2017
Analog Design Journal 4Q 2012 Issue Analog Applications Journal 25 Sep 2012

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI SPICE-based analog simulation program

Reference designs

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

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