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 71 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. 178-8879
Mfr. Part No.LME49724MR/NOPB
HK$35.189
Each (In a Tube of 95)
units
- - - - - - - - - - - - - -
RS Stock No. 100-0776
Mfr. Part No.INA132UA
HK$24.58
Each (In a Tube of 75)
units
Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 824-7020
Mfr. Part No.LME49724MR/NOPB
HK$28.485
Each (In a Pack of 2)
units
Dual - ±2.5 → ±18V - - - 50MHz - - 1 Surface Mount SOIC 8 -
RS Stock No. 252-1644
Mfr. Part No.INA132UA
HK$28.95
Each
units
Dual, Single 5 V ±15V 0.75mV 0.08MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 100-0744
Mfr. Part No.INA105KP
HK$84.641
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
HK$98.29
Each
units
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
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. 100-3838
Mfr. Part No.INA148UA
HK$42.70
Each (In a Tube of 75)
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 5mV 2MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS Stock No. 162-5023
Mfr. Part No.INA154UA
HK$22.008
Each (In a Tube of 75)
units
Dual - ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 660-5207
Mfr. Part No.INA106U
HK$111.14
Each
units
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Surface Mount SOIC 8 -
RS Stock No. 914-2982
Mfr. Part No.LMH3401IRMST
HK$162.90
Each
units
Single 5 V - - 29(Differential) Ω, 55 (Single) Ω 16dB 4 (Small Signal) GHz, 7 (Large Signal) GHz - - 1 Surface Mount UQFN 14 -
RS Stock No. 661-2527
Mfr. Part No.THS4141CD
HK$88.23
Each
units
Dual, Single 5 V ±15V 7mV 14.4MΩ 67dB - 75dB - 1 Surface Mount SOIC 8 -
RS Stock No. 914-3046
Mfr. Part No.THS4541IRGTT
HK$57.18
Each
units
Single 3 V - 850µV - 119dB 850MHz 85dB - 1 Surface Mount QFN 16 Rail to Rail Output
RS Stock No. 197-7164
Mfr. Part No.INA148UA
HK$43.981
Each (In a Tube of 75)
units
Dual 2.7 → 36 V - ±5mV - - 100kHz - - 1 - SOIC 8 -
RS Stock No. 197-7132
Mfr. Part No.INA105KU
HK$63.633
Each (In a Tube of 75)
units
Single 12 V ±18V 50µV - - 1MHz - - 1 - SOIC 8 -
RS Stock No. 162-5518
Mfr. Part No.THS4130CDGN
HK$67.517
Each (In a Tube of 80)
units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS Stock No. 121-8455
Mfr. Part No.INA106KP
HK$93.782
Each (In a Tube of 50)
units
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Through Hole PDIP 8 -
RS Stock No. 162-9811
Mfr. Part No.LMH3401IRMST
HK$112.487
Each (On a Reel of 250)
units
Single 5 V - - 29(Differential) Ω, 55 (Single) Ω 16dB 4 (Small Signal) GHz, 7 (Large Signal) GHz - - 1 Surface Mount UQFN 14 -
RS Stock No. 378-2733
Mfr. Part No.INA133UA
HK$28.55
Each
units
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±15V 1.5mV 0.05MΩ 0dB - 74dB - 1 Surface Mount SOIC 8 -
RS Stock No. 218-8382
Mfr. Part No.INA117KU
HK$85.06
Each
units
Dual - ±15V 2mV 0.8MΩ 0dB - 66dB - 1 Surface Mount SOIC 8 -