Differential Amplifiers

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

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 will 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, such as 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 also 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 do CMRR and PSRR stand for?

  • CMRR is the abbreviated version of Common Mode Rejection Ratio and refers to the power ratio of differential gains between the common-mode gain. This unit is measured in positive decibels.
  • PSRR is the abbreviated version of Power Supply Rejection Ratio and refers to an amplifiers ability to consistently maintain output voltage white the DC voltage supplied is varied.

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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. 914-3046
Mfr. Part No.THS4541IRGTT
£5.46
Each
Units
Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 786-3362
Mfr. Part No.AD8476ARMZ
£4.07
Each
Units
Dual 3 → 18 V ±1.5 → ±9V 900µV - 1V/V 6MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 764-8788
Mfr. Part No.ADA4940-2ACPZ-R7
£5.07
Each
Units
Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
RS Stock No. 761-8582
Mfr. Part No.LT1994CMS8#PBF
£2.93
Each
Units
Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 824-7020
Mfr. Part No.LME49724MR/NOPB
£2.325
Each (In a Pack of 2)
Units
Dual - ±2.5 → ±18V - - - 50MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
£2.806
Each (In a Pack of 5)
Units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 178-8879
Mfr. Part No.LME49724MR/NOPB
£2.788
Each (In a Tube of 95)
Units
- - - - - - - - - - - - - -
RS Stock No. 496-7171
Mfr. Part No.AD8139ARDZ
£6.62
Each
Units
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. 697-6953
Mfr. Part No.AD598JRZ
£38.59
Each
Units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 912-6312
Mfr. Part No.ADA4932-1YCPZ-R2
£4.417
Each (On a Reel of 250)
Units
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
£6.90
Each
Units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 155-7739
Mfr. Part No.LTC6409CUDB#TRMPBF
£5.348
Each (On a Reel of 500)
Units
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. 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. 764-8794
Mfr. Part No.ADA4932-2YCPZ-R7
£8.64
Each
Units
Dual, Single 3 → 11 V ±5V 2.2mV 11MΩ 66dB 1GHz -100dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 100-0768
Mfr. Part No.INA117KU
£5.395
Each (In a Tube of 75)
Units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 697-7521
Mfr. Part No.ADA4932-1YCPZ-R2
£6.78
Each
Units
Dual, Single 5 V, 9 V ±3 V, ±5 V 2.2mV 16MΩ 66dB - 87dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 823-0041
Mfr. Part No.LTC6409CUDB#TRMPBF
£8.78
Each
Units
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. 759-0046
Mfr. Part No.AD8276BRMZ
£2.96
Each
Units
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Through Hole MSOP 8 Rail to Rail Output
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. 806-7896
Mfr. Part No.AD8208WBRMZ
£3.265
Each (In a Pack of 2)
Units
Single 4.5 → 5.5 V - ±2mV 220 (Common Mode) kΩ, 440 (Differential) kΩ 10V/V 70kHz 80dB - 1 Surface Mount MSOP 8 -