The MOSFET in the circuit of Fig. P7.121 has Vt = 0.8 V, kn = 5 mA/V2 , and VA = 40 V
Chapter 7, Problem 7.121(choose chapter or problem)
The MOSFET in the circuit of Fig. P7.121 has Vt = 0.8 V, kn = 5 mA/V2 , and VA = 40 V. (a) Find the values of RS , RD, and RG so that ID = 0.4 mA, the largest possible value for RD is used while a maximum signal swing at the drain of 0.8 V is possible, and the input resistance at the gate is 10 M. Neglect the Early effect. (b) Find the values of gm and ro at the bias point. (c) If terminal Z is grounded, terminal X is connected to a signal source having a resistance of 1 M, and terminal Y is connected to a load resistance of 10 k, find the voltage gain from signal source to load. (d) If terminal Y is grounded, find the voltage gain from X to Z with Z open-circuited. What is the output resistance of the source follower? RS RG Y RD 5 V 5 V X Z Figure P7.121 (e) If terminal X is grounded and terminal Z is connected to a current source delivering a signal current of 50 A and having a resistance of 100 k, find the voltage signal that can be measured at Y. For simplicity, neglect the effect of ro. *7.12
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