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. 697-7521
Mfr. Part No.ADA4932-1YCPZ-R2
MYR38.99
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. 786-3362
Mfr. Part No.AD8476ARMZ
MYR22.52
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. 183-1989
Mfr. Part No.AD8475BRMZ
MYR31.05
Each (In a Pack of 2)
units
Dual, Single 3 → 10 V ±1.5 to ±5V - 1.75kΩ - 150MHz 86dB Differential 1 Surface Mount MSOP 10 Rail to Rail Input/Output
RS Stock No. 661-2517
Mfr. Part No.THS4130CDGN
MYR36.36
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
MYR15.612
Each (In a Pack of 5)
units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 809-9266
Mfr. Part No.AD8137YCPZ-REEL7
MYR11.888
Each (In a Pack of 5)
units
Single 2.7 → 12 V - 2.6mV 800kΩ 91dB 110MHz 66dB - 1 Surface Mount LFCSP WD 8 Rail to Rail Output
RS Stock No. 819-7310
Mfr. Part No.AD626BNZ
MYR67.93
Each
units
Dual, Single 2.4 → 10 V ±1.2 → ±6V 500µV 200kΩ - 100kHz 55dB - 1 Through Hole PDIP 8 -
RS Stock No. 193-5521
Mfr. Part No.MCP6D11-E/MG
BrandMicrochip
MYR5.688
Each (In a Tube of 120)
units
Single 2.5 V - - - - - - - - SMD - - -
RS Stock No. 153-3196
Mfr. Part No.AD8390AACPZ-R7
MYR12.00
Each (In a Pack of 2)
units
Dual, Single - - +3V - - 45MHz 58dB Differential 2 Surface Mount LFCSP 16 No
RS Stock No. 806-8010
Mfr. Part No.AD8479ARZ
MYR28.44
Each
units
Dual - ±2.5 → ±18V 3mV - - 130MHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 779-9564
Mfr. Part No.LT1994IMS8#PBF
MYR19.115
Each (In a Pack of 2)
units
Single 3 V - ±3mV 4.5kΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 197-7165
Mfr. Part No.INA148UA
MYR30.30
Each (In a Pack of 2)
units
Dual 2.7 → 36 V - ±5mV - - 100kHz - - 1 - SOIC 8 -
RS Stock No. 378-2733
Mfr. Part No.INA133UA
MYR13.21
Each
units
Dual, Single 12 V, 15 V, 18 V, 24 V, 28 V, 5 V, 9 V ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 774-1408
Mfr. Part No.THS4531ID
MYR12.58
Each
units
Single 2.5 → 5.5 V - ±2000µV 200kΩ 114dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 822-5881
Mfr. Part No.LT1990ACS8#PBF
MYR19.79
Each (In a Pack of 2)
units
Single 2.7 to 36 V - 3mV 0.5 (Common Mode) MΩ, 2 (Differential Mode) MΩ - 100kHz - - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 851-6875
Mfr. Part No.LTC1992-2CMS8#PBF
MYR39.56
Each
units
Dual, Single 2.7 → 11 V ±5V ±18mV 500MΩ 80dB 3.2MHz 69dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 923-2433
Mfr. Part No.LMH6552MA/NOPB
MYR26.795
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. 197-7140
Mfr. Part No.INA117KU
MYR28.03
Each (In a Tube of 75)
units
Dual 12 V ±15V 1000µV - - 200kHz - - 1 - SOIC 8 -
RS Stock No. 806-7944
Mfr. Part No.AD8278ARMZ
MYR11.885
Each (In a Pack of 2)
units
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. 162-5517
Mfr. Part No.THS4130CD
MYR29.768
Each (In a Tube of 75)
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -