Determine the input resistance of the CG amplifier of Fig. 3.19 if the transistor operates in the active region with I_D = 100 μA. Let R_D= 10 k „¦, μ_nC_ox= 200 μA/V², λ = 0.01V^ˆ’1, W = 100 μm, and L = 1 μm. Ignore the body effect. Repeat with R_D= 1M „¦. If the 100 μA current flows through R_Din this case, a power-supply voltage of at least 100 V would be required. To overcome this problem, assume that an ideal 100-μA current source is placed in parallel with R_Dhere.

Figure 3.19

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