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. 806-8010
Mfr. Part No.AD8479ARZ
£5.58
Each
Units
Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 100-3829
Mfr. Part No.INA145UA
£3.368
Each (In a Tube of 75)
Units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.08MΩ 60dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 378-2777
Mfr. Part No.INA145UA
£3.99
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 1mV 0.08MΩ 60dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 786-9720
Mfr. Part No.LT6552IS8#PBF
£2.385
Each (In a Pack of 2)
Units
Single 3.3 V - 25mV 300kΩ - 55MHz 58dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 851-6859
Mfr. Part No.LTC6362IMS8#PBF
£3.254
Each (In a Pack of 5)
Units
Single 2.8 → 5.25 V - ±30mV 230kΩ 95dB 180MHz 75dB - 1 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 130-1030
Mfr. Part No.AD8209AWBRMZ
£3.265
Each (In a Pack of 2)
Units
Single 4.5 → 5.5 V - ±2mV - 14V/V 100kHz 80dB Single Ended 1 Surface Mount MSOP 8 -
RS Stock No. 809-9288
Mfr. Part No.AD8207WBRZ
£4.03
Each
Units
Single 3.3 → 5.5 V - 100µV - 20V/V 150kHz 80dB - 1 Surface Mount SOIC 8 No
RS Stock No. 100-3879
Mfr. Part No.THS4131ID
£7.146
Each (In a Tube of 75)
Units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 408-697
Mfr. Part No.LMH6552MA/NOPB
£5.52
Each
Units
Dual, Single 5 V, 9 V ±3 V, ±5 V 16.5mV 0.000015MΩ 0dB - - - 1 Surface Mount SOIC 8 -
RS Stock No. 709-7060
Mfr. Part No.AD8203YRMZ
£1.35
Each
Units
Single 5 V - 2mV 0.38MΩ - 60kHz 80dB - 2 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 820-9466
Mfr. Part No.ADA4830-1BCPZ-R7
£1.328
Each (In a Pack of 5)
Units
Single 2.9 → 5.5 V ±1.5 → ±5V - 20kΩ - 84MHz 45dB - 1 Surface Mount LFCSP 8 Rail to Rail Output
RS Stock No. 923-2433
Mfr. Part No.LMH6552MA/NOPB
£4.748
Each (In a Tube of 95)
Units
Dual, Single 5 V, 9 V ±3 V, ±5 V 16.5mV 0.000015MΩ 0dB - - - 1 Surface Mount SOIC 8 -
RS Stock No. 159-9268
Mfr. Part No.ADA4950-2YCPZ-R7
£6.011
Each (On a Reel of 1500)
Units
Dual, Single 3 → 11 V ±5V 2.5mV 32kΩ 66dB 750MHz -64dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 462-0737
Mfr. Part No.THS4131ID
£8.29
Each
Units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 709-5077
Mfr. Part No.AD8206YRZ
£2.44
Each
Units
Single 5 V - 2mV 0.4MΩ 26.02dB 100kHz 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 764-8797
Mfr. Part No.ADA4950-2YCPZ-R7
£8.21
Each
Units
Dual, Single 3 → 11 V ±5V 2.5mV 32kΩ 66dB 750MHz -64dB - 2 Surface Mount LFCSP VQ 24 -
RS Stock No. 160-9813
Mfr. Part No.ADA4830-1BCPZ-R7
£0.693
Each (On a Reel of 1500)
Units
Single 2.9 → 5.5 V ±1.5 → ±5V - 20kΩ - 84MHz 45dB - 1 Surface Mount LFCSP 8 Rail to Rail Output
RS Stock No. 759-1291
Mfr. Part No.AD8276BRZ
£2.96
Each
Units
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. 660-5320
Mfr. Part No.INA157U
£3.84
Each
Units
Dual - ±15V 0.5mV 0.024MΩ 6.02dB - 86dB - 1 Surface Mount SOIC 8 -
RS Stock No. 160-2877
Mfr. Part No.ADA4940-1ACPZ-R2
£3.04
Each (On a Reel of 250)
Units
Single 7 V - 0.35mV 50MΩ 99dB 260MHz 86dB - 1 Surface Mount LFCSP 16 Rail to Rail Output