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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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Maximum Input Offset Voltage Maximum Input Resistance Maximum Voltage Gain Typical Gain Bandwidth Product Minimum CMRR Output Configuration Number of Channels per Chip Mounting Type Package Type Pin Count Rail to Rail
RS Stock No. 912-9936
Mfr. Part No.ADA4940-2ACPZ-R7
£3.111
Each (On a Reel of 1500)
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Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
RS Stock No. 914-3046
Mfr. Part No.THS4541IRGTT
£5.46
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Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 761-8582
Mfr. Part No.LT1994CMS8#PBF
£2.93
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Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 764-8788
Mfr. Part No.ADA4940-2ACPZ-R7
£5.07
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Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
RS Stock No. 178-8879
Mfr. Part No.LME49724MR/NOPB
£2.788
Each (In a Tube of 95)
Units
- - - - - - - - - - - - - -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
£2.806
Each (In a Pack of 5)
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Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 824-7020
Mfr. Part No.LME49724MR/NOPB
£2.185
Each (In a Pack of 2)
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Dual - ±2.5 → ±18V - - - 50MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 697-6953
Mfr. Part No.AD598JRZ
£38.59
Each
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- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 496-7171
Mfr. Part No.AD8139ARDZ
£6.62
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Dual, Single 5 V, 9 V ±3 V, ±5 V 0.5mV 1.5MΩ 0.009dB - 75dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 823-0041
Mfr. Part No.LTC6409CUDB#TRMPBF
£8.78
Each
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Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS Stock No. 697-7521
Mfr. Part No.ADA4932-1YCPZ-R2
£6.78
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Dual, Single 5 V, 9 V ±3 V, ±5 V 2.2mV 16MΩ 66dB - 87dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 155-7739
Mfr. Part No.LTC6409CUDB#TRMPBF
£5.348
Each (On a Reel of 500)
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Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS Stock No. 100-0768
Mfr. Part No.INA117KU
£5.395
Each (In a Tube of 75)
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Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 764-8794
Mfr. Part No.ADA4932-2YCPZ-R7
£8.64
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Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 912-6312
Mfr. Part No.ADA4932-1YCPZ-R2
£4.417
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Dual, Single 5 V, 9 V ±3 V, ±5 V 2.2mV 16MΩ 66dB - 87dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 218-8382
Mfr. Part No.INA117KU
£6.34
Each
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Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 159-9267
Mfr. Part No.ADA4932-2YCPZ-R7
£6.011
Each (On a Reel of 1500)
Units
Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 806-7944
Mfr. Part No.AD8278ARMZ
£2.14
Each (In a Pack of 2)
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Dual, Single 2 → 36 V ±2 → ±18V 500µV 120 (Differential) kΩ, 30 (Common Mode) kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 806-7947
Mfr. Part No.AD8278ARZ
£2.015
Each (In a Pack of 2)
Units
Dual, Single 2 → 36 V ±2 → ±18V - - - - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 538-6595
Mfr. Part No.AD628ARMZ
£4.32
Each
Units
Dual, Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 3mV 0.22MΩ 40dB - 75dB - 2 Surface Mount MSOP 8 -