A fully differential amplifier (FDA) is a DC-coupled high-gain electronic voltage amplifier with differential inputs and differential outputs. In its ordinary usage, the output of the FDA is controlled by two feedback paths which, because of the amplifier's high gain, almost completely determine the output voltage for any given input.
In a fully differential amplifier, common-mode noise such as power supply disturbances is rejected; this makes FDAs especially useful as part of a mixed-signal integrated circuit.[1]
An FDA is often used to convert an analog signal into a form more suitable for driving into an analog-to-digital converter; many modern high-precision ADCs have differential inputs.[2][3][4]
- ^ Nancy Y. Sun. "A DC Stabilized Fully Differential Amplifier". 2005. p. 22.
- ^ Jim Karki. "Fully differential amplifiers", 2000.
- ^ Michael Steffes. "Wideband fully differential amplifier noise improved using active match", 2013-06-09.
- ^ Rick. "ADC Input Driver FULLY DIFFERENTIAL AMPLIFIER"