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CIRCUIT060058

Single-supply, low-input voltage full-wave rectifier circuit

CIRCUIT060058

Overview

This single-supply precision absolute value circuit is optimized for low-input voltages. It is designed to function up to 50 kHz and has excellent linearity at signal levels as low as 5 mVpp. The design uses a negative charge pump (such as LM7705) on the negative op amp supply rails to maintain linearity with signal levels near 0 V.
Features
  • Input: Vi = 5 mV to 400 mV
  • Output: Vo = 2.5 mV to 200 mV
  • Supply:
    • Vcc = 5 V
    • Vee = -0.23 V
    • Vref = 0 V
Precision op amps (Vos<1mV)
OPA350 — Single, single-supply, rail-to-rail, high speed, low noise operational amplifier
General-purpose op amps
OPA353 — Single, 5.5-V, 44-MHz, low noise (7-nV/√Hz), RRIO operational amplifier
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Technical documentation

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Type Title Date
* Circuit design Single-supply, low-input voltage, full-wave rectifier circuit (Rev. A) 01 Feb 2019
User guide Precision Full-Wave Rectifier, Dual Supply Design Guide 08 Jan 2014
Application note Single-Supply Op Amp Design Techniques (Rev. A) 14 Mar 2001

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Reference designs

REFERENCE DESIGN
TIPD124 — Single-Supply Low-Input Voltage Optimized Precision Full-Wave Rectifier Reference Design

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