Physics · Analog Electronics
In a small-signal common-gate equivalent circuit, an enhancement-mode n-channel MOSFET is biased in saturation with transconductance gm. If the input signal is injected at the source node P and channel length modulation is ignored, the small-signal impedance looking into node P with the gate grounded is given by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1RLgm1 + Rsgm(RL || gm-1)
- 2(Rs + RL)gm-1
- 3Rs || gm-1✓
- 4Rs || RL || gm-1
Correct answer
Rs || gm-1
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