![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Op-amp_symbol.svg/640px-Op-amp_symbol.svg.png&w=640&q=50)
Differential amplifier
Electrical circuit component which amplifies the difference of two analog signals / From Wikipedia, the free encyclopedia
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A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs.[1] It is an analog circuit with two inputs and
and one output
, in which the output is ideally proportional to the difference between the two voltages:
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/97/Op-amp_symbol.svg/320px-Op-amp_symbol.svg.png)
See also: Operational amplifier
where is the gain of the amplifier.
Single amplifiers are usually implemented by either adding the appropriate feedback resistors to a standard op-amp, or with a dedicated integrated circuit containing internal feedback resistors. It is also a common sub-component of larger integrated circuits handling analog signals.