GATE EC 2014 Set 1 — Question 22
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Analog Circuits → Feedback & Oscillators → Negative Feedback Topologies
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Question
In the ac equivalent circuit shown in the figure, if is the input current and is very large, the type of feedback is
Correct answer
(B) voltage-current feedback
Solution
To determine the type of feedback, we analyze how the feedback network samples the output and mixes with the input:
1.Sampling at the Output: The feedback resistor is connected directly to the output node where is measured. Since the feedback network is in parallel with the output voltage, it samples the output voltage. This is voltage sampling.
2.Mixing at the Input: The input signal is a current source applied to the source of MOSFET . The feedback current through is injected into this same node. Since the feedback signal and the input signal are currents being summed at a node (shunt connection), this is current mixing (or shunt mixing).
3.Topology: A feedback configuration that samples voltage and mixes current is known as Voltage-Shunt feedback. In the terminology used in the options, this corresponds to voltage-current feedback (Sampling-Mixing).
Therefore, the correct option is (B).Continue learning with Success Tracker
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