# Homework9 - UNIVERSITY OF CALIFORNIA AT BERKELEY College of...

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UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Dept. of Electrical Engineering and Computer Sciences Problem Set #9 Due Tuesday, April 18, 2006. EE 105 Spring 2006 1. Consider the following circuit of a p-channel common-source amplifier. V DD = V SS = 2.5 V I REF = 100 μ A R S = 10 k Ω , R L = 1 M Ω ( W / L ) 1 = ( W / L ) 2 = ( W / L ) 3 = 50/2 μ n C ox = 50 μ A/V 2 , μ p C ox = 25 μ A/V 2 V Tn = - V Tp = 1 V λ n = λ p = 0.05 V -1 C ox = 2.3 fF/ μ m 2 C jn = 0.5 fF/ μ m 2 , C jp = 0.3 fF/ μ m 2 C jswn = 0.5 fF/ μ m, C jswp = 0.35 fF/ μ m C ovn = 0.5 fF/ μ m, C ovp = 0.5 fF/ μ m L diffn = L diffp = 6 μ m a) Find the DC gate bias ( V I ) of M 1 such that the DC output voltage V O = 0 V. b) Draw the small-signal model of this amplifier and find the values of circuit elements in the small signal model. You should include the PMOS transistor device capacitances C gs 1 and C gd 1 as well as the capacitance at the load which is the sum of C db 1 , C db 2 and C gd 2 . c) Use the open-circuit time-constant method and find ω 3 dB for the circuit.

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• Spring '06
• MingWu
• Computer Science, Amplifier, Small-signal model, Early effect, µp Cox, BERKELEY College of Engineering Dept. of Electrical Engineering and Computer Sciences, open-circuit time-constant method

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