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CIRCUIT060024
Difference amplifier (subtractor) circuit
CIRCUIT060024
Overview
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.
Features
- Input: ±1.25 V
- Output: ±2.5 V
- CMRR (min): 50 dB
- Supply:
- Vcc = 2.75 V
- Vee = -2.75 V
- Vref = 0 V
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Technical documentation
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Type | Title | Date | |
---|---|---|---|
* | Circuit design | Difference amplifier (subtractor) circuit (Rev. A) | Jan. 31, 2019 |
Application note | AN-31 Amplifier Circuit Collection (Rev. D) | Oct. 21, 2020 | |
Application note | Handbook of Operational Amplifier Applications (Rev. B) | Sep. 19, 2016 |
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