In the circuit below, VDD = 3 V, R1 = 50 kΩ, R2 = 100 kΩ, R3 = R4 = 5

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In the circuit below, VDD = 3 V, R1 = 50 kΩ, R2 = 100 kΩ, R3 = R4 = 5 kΩ, Rs = 1 kΩ and RL = 30 kΩ, C1, C2 and C3 have large values. The transistor operates at the DC point of ID = 0.2 mA, VDS = 1 V and VGS − VTN = 0.5 V. The transistor has λ = 0.1 V−1 and a negligible body effect. (a) Identify the circuit as a common-source, common-drain, or common-gate amplifier. (b) Calculate the small-signal parameters gm and rds of the transistor. (c) Draw an AC small-signal equivalent of the circuit, with the transistor represented by its small-signal model. (d) Calculate the AC small-signal voltage gain vo/vs. (e) Calculate the AC small-signal input and output resistances Rin and Rout.

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In the circuit below,

V_{D D} = 3 V, R_{1} = 50 k Ω, R_{2} = 100 k Ω, R_{3} = R_{4} =

5 k Ω, R_{s} = 1 k Ω

and

R_{L} = 30 k Ω, C_{1}, C_{2}

and

C_{3}

have large values. The transistor operates at the DC point of

I_{D} = 0.2 m A, V_{D S} = 1 V

and

V_{G S} - V_{T N} = 0.5 V

. The transistor has

λ = 0.1 V^{- 1}

and a negligible body effect. (a) Identify the circuit as a common-source, common-drain, or common-gate amplifier. (b) Calculate the small-signal parameters

g_{m}

and

r_{d s}

of the transistor. (c) Draw an AC small-signal equivalent of the circuit, with the transistor represented by its small-signal model. (d) Calculate the AC small-signal voltage gain