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programmable gain amplifier (PGA)

Programmable Gain Amplifiers(PGA) are amplifiers with programmable gain. They are operational amplifiers( OpAmp) in which the gain-determining resistor in the feedback between output and input is replaced by a controllable component.

In the programmable gain amplifier, the feedback resistor is replaced by a D/A converter( DAC) whose level values can be controlled. This, in combination with the input resistor, forms the gain-determining resistor network. The feedback resistor (R(DAC)) simulated by the DAC converter determines the relation between output and input voltage in relation to the input resistance. VAoff/VEin corresponds to R(DAC)/REin.

Principle circuit of a Progammable Gain Amplifier (PGA)

Principle circuit of a Progammable Gain Amplifier (PGA)

Since the feedback resistor (R(DAC)) can be programmed in steps with a resolution of up to '2^12', depending on the D/A converter concept, even the gain can be programmed in the smallest steps with the highest accuracy.

Englisch: programmable gain amplifier - PGA
Updated at: 22.01.2022
#Words: 145
Links: professional graphics adapter (PGA), operational amplifier (OpAmp), feedback, indium (In), amplifier (AMP)
Translations: DE

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