13.4. Common-Source Stage as a Series – Series Feedback Circuit
The circuit of Fig. 13.2 with the source resistor is technically a feedback circuit. It falls into the category of series – series feedback, or the feedback network samples the output current and feeds back a voltage in series (and the same polarity, negative feedback) with the input to the common-source stage, that is, Vgs3. The series – series feedback amplifier is referred to as a transconductance amplifier. The noninverting and inverting opamp configurations are series – shunt (voltage amplifier) and shunt – shunt (transresistance amplifier), respectively. An additional alternative is shunt – series (current amplifier). An example of this type of feedback amplifier is discussed ...
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