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CIRCUIT060017

Dual-supply, discrete, programmable gain amplifier circuit

CIRCUIT060017

Overview

This circuit provides programmable, non-inverting gains ranging from 6 dB (2 V/V) to 60 dB (1000 V/V) using a variable input resistance. The design maintains the same cutoff frequency over the gain range.
Features
  • Dual +/- 2.5-V supply
  • Input: +/- 1.25 V
  • Output: +/-2.4 V
  • Bandwidth: 7 kHz
  • Gain: 2 V/V to 1000 V/V
General-purpose op amps
OPA364 — Single, 5.5-V, 7-MHz, RRIO operational amplifier
Precision op amps (Vos<1mV)
OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp
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Technical documentation

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Type Title Date
* Circuit design Dual-supply, discrete, programmable gain amplifier circuit (Rev. A) PDF | HTML 16 Oct 2024
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. D) 24 Sep 2024
Application brief Choosing the Right Multiplexer for a Discrete Programmable Gain Amplifier (PGA) PDF | HTML 29 Sep 2020

Related design resources

Design tools & simulation

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PSPICE-FOR-TI — PSpice® for TI design and simulation tool TINA-TI — SPICE-based analog simulation program
CALCULATION TOOL
ANALOG-ENGINEER-CALC — Analog engineer's calculator

Reference designs

REFERENCE DESIGN
TIPD204 — Low-Cost Digitally Programmable Gain Amplifier Reference Design

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