Differential Amplifiers

A differential amplifier is a type of electronic amplifier that increases the difference between 2 input voltages. Differential amplifiers also suppress and voltage common to the two inputs. A digital amplifier is one of the most used and important components within integrated circuits.

Differential Amplifier inputs

  • One inverting
  • One non-inverting

Why use a Differential Amplifier?

Differential amplifiers are used to amplify balanced differential signals which are used to communicate small signals in electrically noisy environments. The signal wires should be close or wired together and most of the induced noise with be “common mode”, affecting both wires in the same way.

Differential Amplifier Applications

The main application of a differential amplifier is to get rid of any noise and voltages that are present in both of the voltage inputs. This noise is present in common mode fluctuating voltage. Differential amplifiers are used in circuits that utilise negative feedback, controlling motors and signal amplification.

Various electronic devices use differential amplifiers

  • FM/Am Radio signal recovery
  • Audio pre-amplifiers
  • Microphone pre-amplifiers
  • TV Signal recovery
  • Digital to analogue converters

A Differential amplifier can be configured to operate as a single-ended amplifier by grounding one of the inputs.

Modern differential amplifiers normally sit on a single microchip. Inside the microchip, positive and negative signals are added and become a single output.

What is CMRR and PSRR?

CMRR – Common mode rejection ratio
PSSR – Power supply rejection ratio


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RS Stock No. 145-6906
Mfr. Part No.THS4509RGTT
£4.832
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Dual, Single 5 V ±2.5V 4mV 0.05MΩ 68dB 3GHz - - 1 Surface Mount QFN 16 -
RS Stock No. 252-1644
Mfr. Part No.INA132UA
£2.84
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Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 697-7252
Mfr. Part No.AD8275ARMZ
£3.44
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Dual, Single 5 V ±3 V, ±5 V - 0.108MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 709-5068
Mfr. Part No.AD8202YRZ
£2.66
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Single 5 V, 9 V - 2mV - 40dB - 82dB - 1 Surface Mount SOIC 8 -
RS Stock No. 820-9454
Mfr. Part No.AD8274ARMZ
£1.106
Each (In a Pack of 5)
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Dual - ±2.5 → ±18V 1100µV 9kΩ - 10MHz 83dB - 1 Surface Mount MSOP 8 -
RS Stock No. 162-6741
Mfr. Part No.THS4531ID
£1.958
Each (In a Tube of 75)
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Single 2.5 → 5.5 V - ±2000µV 200kΩ 114dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 779-9564
Mfr. Part No.LT1994IMS8#PBF
£3.38
Each (In a Pack of 2)
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Single 3 V - ±3mV 4.5kΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 162-9811
Mfr. Part No.LMH3401IRMST
£9.19
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Single 5 V - - 29(Differential) Ω, 55 (Single) Ω 16dB 4 (Small Signal) GHz, 7 (Large Signal) GHz - - 1 Surface Mount UQFN 14 -
RS Stock No. 523-0199
Mfr. Part No.AD626ARZ
£7.76
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Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Surface Mount SOIC 8 -
RS Stock No. 914-2982
Mfr. Part No.LMH3401IRMST
£13.31
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Single 5 V - - 29(Differential) Ω, 55 (Single) Ω 16dB 4 (Small Signal) GHz, 7 (Large Signal) GHz - - 1 Surface Mount UQFN 14 -
RS Stock No. 462-0967
Mfr. Part No.THS4505DGN
£4.50
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Dual, Single 5 V ±5V 7mV 0.025MΩ 54dB 200MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 660-4248
Mfr. Part No.INA133U
£3.05
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Dual, Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V ±15V 0.75mV 0.05MΩ 0dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 774-1408
Mfr. Part No.THS4531ID
£2.31
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Single 2.5 → 5.5 V - ±2000µV 200kΩ 114dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 100-0776
Mfr. Part No.INA132UA
£2.10
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Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 145-7532
Mfr. Part No.INA133U
£2.63
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Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±15V 0.75mV 0.05MΩ 0dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 759-1297
Mfr. Part No.AD8276ARZ
£2.02
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Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 759-0083
Mfr. Part No.AD8475ARMZ
£4.28
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Dual, Single 3 → 10 V ±1.5 → ±5V - .0029MΩ - 150MHz 76dB - - Surface Mount MSOP 10 Rail to Rail Output
RS Stock No. 709-7070
Mfr. Part No.AD8216YRZ
£3.17
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Single 5 V - 0.5mV 0.4MΩ 9.54dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 806-8010
Mfr. Part No.AD8479ARZ
£5.42
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Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 806-7903
Mfr. Part No.AD8216WYRZ
£3.70
Each (In a Pack of 2)
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Single 4.5 → 5.5 V - ±0.5 (Typical)mV 200 (Common Mode) kΩ, 400 (Differential) kΩ 3 (Typical)V/V 3MHz - - 1 Surface Mount SOIC 8 -