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CIRCUIT060023

Inverting summer circuit

CIRCUIT060023

Overview

This design sums (adds) and inverts two input signals, Vi1 and Vi2. The input signals typically come from lowimpedance sources because the input impedance of this circuit is determined by the input resistors, R1 and R2. The common-mode voltage of an inverting amplifier is equal to the voltage connected to the non-inverting node, which is ground in this design.
Features
  • Input 1: ±2.5 V
  • Input 2: ±250 mV
  • Output: ± 4.9 V
  • Frequency: 10 kHz
  • Supply: ±5 V
General-purpose op amps
LMC7101 — Single, 15.5-V, 1.1-MHz operational amplifier OPA170 — Single, 36-V, 1.2-MHz, low-power operational amplifier
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Technical documentation

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Type Title Date
* Circuit design Inverting Summer Circuit (Rev. C) PDF | HTML 01 Feb 2021
Application note AN-31 Amplifier Circuit Collection (Rev. D) 21 Oct 2020
Application note Handbook of Operational Amplifier Applications (Rev. B) 19 Sep 2016

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