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.

...
Read more Read less

Filters

Viewing 1 - 20 of 157 products
Results per page
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. 427-008
Mfr. Part No.AD629BRZ
MYR58.20
Each
units
Dual - ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 0.5mV 0.8MΩ 0dB - 86dB - 1 Surface Mount SOIC 8 -
RS Stock No. 100-0744
Mfr. Part No.INA105KP
MYR47.042
Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 647-659
Mfr. Part No.INA105KP
MYR50.31
Each
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS Stock No. 121-8455
Mfr. Part No.INA106KP
MYR51.798
Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Through Hole PDIP 8 -
RS Stock No. 647-665
Mfr. Part No.INA106KP
MYR63.95
Each
units
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Through Hole PDIP 8 -
RS Stock No. 822-5828
Mfr. Part No.LTC1992CMS8#PBF
MYR16.555
Each (In a Pack of 2)
units
Dual, Single 2.7 → 11 V ±1.35 → ±5V ±2.5mV 500MΩ 80dB 3MHz - - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 778-5118
Mfr. Part No.AD8476BRMZ
MYR30.39
Each
units
Dual 3 to 18 V ±1.5 to ±9V - 500kΩ 1V/V 6MHz 90dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 527-580
Mfr. Part No.THS4131CD
MYR35.67
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 145-6906
Mfr. Part No.THS4509RGTT
MYR50.661
Each (On a Reel of 250)
units
Dual, Single 5 V ±2.5V 4mV 0.05MΩ 68dB 3GHz - - 1 Surface Mount QFN 16 -
RS Stock No. 162-4336
Mfr. Part No.THS4131CD
MYR39.704
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. 759-0042
Mfr. Part No.AD8276ARMZ
MYR13.48
Each
units
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS Stock No. 759-0055
Mfr. Part No.AD8277ARZ
MYR20.54
Each
units
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 2 Surface Mount SOIC 14 Rail to Rail Output
RS Stock No. 761-9285
Mfr. Part No.LTC1992IMS8#PBF
MYR23.38
Each
units
Dual, Single 2.7 V ±5V ±2.5mV 500MΩ 80dB 4MHz 60dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
RS Stock No. 806-7941
Mfr. Part No.AD8278BRMZ
MYR18.565
Each (In a Pack of 2)
units
Dual, Single 2 → 36 V ±2 → ±18V 500µV 120kΩ - 1MHz 74dB - 1 Surface Mount MSOP 8 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
MYR16.726
Each (In a Pack of 5)
units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 159-9268
Mfr. Part No.ADA4950-2YCPZ-R7
MYR42.45
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. 697-6953
Mfr. Part No.AD598JRZ
MYR273.44
Each
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 462-0715
Mfr. Part No.THS4130ID
MYR40.61
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 145-3380
Mfr. Part No.MC10H116FNG
Brandonsemi
MYR16.20
Each (In a Tube of 46)
units
Single -5.2 V - - - - - - - 1 Surface Mount PLCC 20 -
RS Stock No. 162-5520
Mfr. Part No.THS4141CD
MYR35.153
Each (In a Tube of 75)
units
Dual, Single 5 V ±15V 7mV 14.4MΩ 67dB - 75dB - 1 Surface Mount SOIC 8 -