Differential Amplifiers

What is a Differential Amplifier?
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 on the most used and important components within integrated circuits.

Differential Amplifier 2 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 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
New
RS Stock No. 197-7167
Mfr. Part No.INA149AID
£5.20
Each (In a Pack of 2)
Units
Dual, Single - ±2 to ±18V 1100µV - - 500kHz - - 1 - SOIC 8 -
RS Stock No. 100-3878
Mfr. Part No.THS4130IDGN
£5.856
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. 153-3156
Mfr. Part No.AD8390AACPZ-R7
£1.304
Each (On a Reel of 1500)
Units
Dual, Single - - +3V - - 45MHz 58dB Differential 2 Surface Mount LFCSP 16 No
New
RS Stock No. 197-7141
Mfr. Part No.INA117KU
£6.42
Each
Units
Dual 12 V ±15V 1000µV - - 200kHz - - 1 - SOIC 8 -
RS Stock No. 462-0721
Mfr. Part No.THS4130IDGN
£7.00
Each
Units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
RS Stock No. 183-1764
Mfr. Part No.AD8475BRMZ
£3.89
Each (In a Tube of 50)
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. 653-1336
Mfr. Part No.THS4131IDGN
£6.72
Each
Units
Dual, Single 5 V ±15V 2mV 34MΩ 78dB 225MHz 80dB - 1 Surface Mount MSOP 8 -
New
RS Stock No. 193-5522
Mfr. Part No.MCP6D11-E/MG
BrandMicrochip
£1.22
Each (In a Pack of 5)
Units
Single 2.5 V - - - - - - - - SMD - - -
New
RS Stock No. 197-7140
Mfr. Part No.INA117KU
£5.321
Each (In a Tube of 75)
Units
Dual 12 V ±15V 1000µV - - 200kHz - - 1 - SOIC 8 -
RS Stock No. 822-5881
Mfr. Part No.LT1990ACS8#PBF
£3.595
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
New
RS Stock No. 197-7133
Mfr. Part No.INA105KU
£6.42
Each
Units
Single 12 V ±18V 50µV - - 1MHz - - 1 - SOIC 8 -
RS Stock No. 145-7195
Mfr. Part No.AD8271ARMZ
£1.918
Each (In a Tube of 50)
Units
Dual - ±2.5 → ±18V 1500µV 1GΩ - 20MHz 80dB - 1 Surface Mount MSOP 10 Rail to Rail Input
Related Products
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...
Differential Amplifiers by Analog Devices are integrated and ...
Description:
Differential Amplifiers by Analog Devices are integrated and optimised for differential signalling applications. These speciality amplifiers have inherent common mode rejection properties that provide a low harmonic distortion with an output gain and phase matching. Applications include driving or receiving signals over long cable lengths, driving a balanced ADC input ...