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In which network is the unit of the feedback factor Ω?

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In which network is the unit of the feedback factor Ω?

(a) Shunt-shunt feedback

(b) Shunt-series feedback

(c) Series-series feedback

(d) Series-shunt feedback

I have been asked this question in final exam.

My question is from Feedback Connection Types topic in chapter General and Feedback Amplifiers of Analog Circuits

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Correct option is (c) Series-series feedback

To explain I would say: In series-series feedback, the output is current sampled, that is it is in series with the load. Also, input is a voltage mixer, which is in series with signal source. So feedback factor

Β = VF/IL in Ohms.

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