Figure P10.106 shows an amplifier formed by cascading two CS stages. Note that the input
Chapter 10, Problem 10.106(choose chapter or problem)
Figure P10.106 shows an amplifier formed by cascading two CS stages. Note that the input bias voltage is not shown. Each of Q1 and Q2 is operated at an overdrive voltage of 0.2 V, and VA = 10 V. The transistor capacitances are as follows: Cgs = 20 fF, Cgd = 5 fF, and Cd b = 5 fF. The signal-source resistance Rsig = 10 k. (a) Find the dc voltage gain. (b) Use the method of open-circuit time constants to determine an estimate for the 3-dB frequency fH . Q2 Q1 0.1 mA 0.1 mA Vo Vsig Rsig VDD Figure P10.106
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