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. 709-7070
Mfr. Part No.AD8216YRZ
HK$38.57
Each
units
Single 5 V - 0.5mV 0.4MΩ 9.54dB - 80dB - 1 Surface Mount SOIC 8 -
RS Stock No. 806-7903
Mfr. Part No.AD8216WYRZ
HK$44.155
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Single 4.5 → 5.5 V - ±0.5 (Typical)mV 200 (Common Mode) kΩ, 400 (Differential) kΩ 3 (Typical)V/V 3MHz - - 1 Surface Mount SOIC 8 -
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Mfr. Part No.INA132UA
HK$24.58
Each (In a Tube of 75)
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Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 252-1644
Mfr. Part No.INA132UA
HK$27.57
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Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
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Mfr. Part No.AD8276ARZ
HK$24.06
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Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
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Mfr. Part No.LME49724MR/NOPB
HK$35.189
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- - - - - - - - - - - - - -
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Mfr. Part No.LME49724MR/NOPB
HK$25.265
Each (In a Pack of 2)
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Dual - ±2.5 → ±18V - - - 50MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 100-0744
Mfr. Part No.INA105KP
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Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
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Mfr. Part No.ADA4927-1YCPZ-R2
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Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 778-5118
Mfr. Part No.AD8476BRMZ
HK$57.64
Each
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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. 807-1665
Mfr. Part No.ADA4927-1YCPZ-R2
HK$98.54
Each
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Dual, Single 5 V ±5V 5.2mV 7.5kΩ 1V/V 2GHz -70dB - 1 Surface Mount LFCSP 16 -
RS Stock No. 162-8363
Mfr. Part No.THS4531AID
HK$22.919
Each (In a Tube of 75)
units
Single 2.5 → 5.5 V - ±2000µV - 113dB 27MHz 90dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS Stock No. 761-8582
Mfr. Part No.LT1994CMS8#PBF
HK$35.84
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Single 3 V - ±3mV .0045MΩ 100dB 70MHz 55dB - 2 Surface Mount MSOP 8 Rail to Rail Input/Output
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Mfr. Part No.THS4130CD
HK$64.344
Each (In a Tube of 75)
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Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -
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Mfr. Part No.INA2132U
HK$55.80
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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 -
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Mfr. Part No.ADA4940-2ACPZ-R7
HK$44.018
Each (On a Reel of 1500)
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Single 5 V - 0.35mV 33kΩ 99dB 260MHz 86dB - 2 Surface Mount LFCSP VQ 24 Rail to Rail Output
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HK$41.08
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Single -5.2 V - - - - - - - 1 Surface Mount PLCC 20 -
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Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 2 Surface Mount SOIC 14 Rail to Rail Output
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Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount SOIC 8 -