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. 697-6988
Mfr. Part No.AD698APZ
$76.86
Each
units
- 17.5 V 13V - - - - - - - Surface Mount PLCC 28 -
RS Stock No. 162-4336
Mfr. Part No.THS4131CD
$12.359
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. 527-580
Mfr. Part No.THS4131CD
$13.83
Each
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 100-0768
Mfr. Part No.INA117KU
$11.95
Each (In a Tube of 75)
units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 538-8434
Mfr. Part No.AD8205YRZ
$6.066
Each (In a Pack of 5)
units
Single 5 V - 2mV 0.4MΩ 33.98dB - 76dB - 1 Surface Mount SOIC 8 -
RS Stock No. 218-8382
Mfr. Part No.INA117KU
$14.36
Each
units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -
RS Stock No. 697-6953
Mfr. Part No.AD598JRZ
$84.52
Each
units
- - - - - - - - - - Surface Mount SOIC W 20 -
RS Stock No. 153-3156
Mfr. Part No.AD8390AACPZ-R7
$3.247
Each (On a Reel of 1500)
units
Dual, Single - - +3V - - 45MHz 58dB Differential 2 Surface Mount LFCSP 16 No
RS Stock No. 806-7941
Mfr. Part No.AD8278BRMZ
$6.61
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. 162-5022
Mfr. Part No.INA154U
$5.533
Each (In a Tube of 75)
units
Dual - ±15V 0.75mV 0.05MΩ 0dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 162-9862
Mfr. Part No.THS4541IRGTT
$7.119
Each (On a Reel of 250)
units
Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 523-0199
Mfr. Part No.AD626ARZ
$16.84
Each
units
Dual, Single 5 V ±5V 2.5mV 0.02MΩ - - 55dB - 1 Surface Mount SOIC 8 -
RS Stock No. 162-5028
Mfr. Part No.INA2132U
$9.188
Each (In a Tube of 50)
units
Dual, Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 0.5mV 0.08MΩ 0dB - 80dB - 2 Surface Mount SOIC 14 -
RS Stock No. 145-6906
Mfr. Part No.THS4509RGTT
$9.546
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. 796-9151
Mfr. Part No.AD8476BCPZ-WP
$10.81
Each
units
Dual, Single 3 → 18 V ±1.5 → ±9V 200µV - - 6MHz 90dB - 1 Surface Mount LFCSP 16 Rail to Rail Output
RS Stock No. 168-4301
Mfr. Part No.AD8137YCPZ-REEL7
$3.776
Each (On a Reel of 1500)
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. 130-1030
Mfr. Part No.AD8209AWBRMZ
$6.88
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. 914-3046
Mfr. Part No.THS4541IRGTT
$13.36
Each
units
Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 162-5023
Mfr. Part No.INA154UA
$3.959
Each (In a Tube of 75)
units
Dual - ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 912-9936
Mfr. Part No.ADA4940-2ACPZ-R7
$6.524
Each (On a Reel of 1500)
units
Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output