|Use the zero-value time-constant method to estimate the small-signal dominant pole for the current gain of the MOS cascode current mirror of Fig. 4.9. Assume an input ac current source in parallel with I and a zero load impedance with V = V + V . The bias current I = 100 µA. Compare your answer with the f value of the devices. Device parameters are Î¼ C = 60 µA/V , Î³ = 0, Î» = 0, V = 0.7 V, W = 10 µm, L = 1 µm, C = 20 fF, C = 3 fF, C = C = 10 fF at the bias point. Compare your answer with a SPICE simulation of the bandwidth of the circuit and use SPICE to find the bandwidth for I = 50 µA and I = 200 µA.|
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