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CIRCUIT060016

Non-inverting microphone pre-amplifier circuit

CIRCUIT060016

Overview

This circuit uses a non–inverting amplifier circuit configuration to amplify the microphone output signal. This circuit has very good magnitude flatness and exhibits minor frequency response deviations over the audio frequency range. The circuit is designed to be operated from a single 5-V supply.
Features
  • Single 5-V supply
  • Input pressure: 100 dB SPL (2 Pa)
  • Max output: 1.228 Vrms
  • Frequency range: 20 Hz to 20 kHz
General-purpose op amps
TLV6741 — Single, 5.5-V, 10-MHz, low noise (4.6-nV/√Hz) operational amplifier
Precision op amps (Vos<1mV)
OPA320 — Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier
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Technical documentation

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Type Title Date
* Circuit design Non-inverting microphone pre-amplifier circuit 30 Dec 2018
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) 18 Dec 2023
User guide Single-Supply Electret Microphone Preamplifier Reference Design 02 Feb 2015

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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
TIPD181 — Single-Supply, Electret Microphone Preamplifier Reference Design

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