Difference amplifier (subtractor) circuit



This design inputs two signals, Vi1 and Vi2, and outputs their difference (subtracts). The input signals typically come from low-impedance sources because the input impedance of this circuit is determined by the resistive network. Difference amplifiers are typically used to amplify differential input signals and reject common-mode voltages. A common-mode voltage is the voltage common to both inputs. The effectiveness of the ability of a difference amplifier to reject a common-mode signal is known as commonmode rejection ratio (CMRR). The CMRR of a difference amplifier is dominated by the tolerance of the resistors.
  • Input: ±1.25 V
  • Output: ±2.5 V
  • CMRR (min): 50 dB
  • Supply:
    • Vcc = 2.75 V
    • Vee = -2.75 V
    • Vref = 0 V
General-purpose op amps
TLV6001 Single, 5.5-V, 1-MHz, RRIO 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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Type Title Date
* Circuit design Difference amplifier (subtractor) circuit (Rev. A) PDF | HTML 31 Jan 2019
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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