For a single-stage common-source MOSFET amplifier with output resistance r_o, the small-signal voltage gain into a high-impedance load is which?
AA_v = -gm/r_o ratio form
BA_v = +gm·r_o always sign
CA_v = -gm·r_o (intrinsic)
DA_v = gm + r_o sum form
Answer & Solution
Correct answer: C. A_v = -gm·r_o (intrinsic)
CS with current-source load: A_v = -gm·(r_o ∥ R_L). With R_L → ∞: |A_v| → gm·r_o = intrinsic gain (Razavi Ch.3). Sets ceiling for single-stage CMOS amp.
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