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Based on the quantity to be amplified (voltage or current) and on the desired form of output (voltage or current), amplifiers can be classified into four categories.
4 FEEDBACK TOPOLOGIES
SAMPLING
The Sampling of the output signal of an amplifier can be in series with the load or in shunt with the load depending on the type of ouput signal (i.e. voltage or current)
MIXING
The Mixing of the feedback signal at the input of an amplifier can be in series with source or in shunt with source depending on the type of input (i.e. voltage or current
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