**7.123 The MOSFET in the amplifier circuit of Fig. P7.123 has Vt = 0.6 V, kn = 5 mA/V2, and VA = 60 V. The signal vsig has a zero average. (a) It is required to bias the transistor to operate at an overdrive voltage VOV = 0.2 V. What must the dc voltage at the drain be? Calculate the dc drain current ID taking into account VA. Now, what value must the drain resistance R D have? (b) Calculate the values of gm and ro at the bias point established in (a). (c) Using the small-signal equivalent circuit of the amplifier, show that the voltage gain is given by

123 - **7.123 The MOSFET in the amplifier circuit of Fig. P7.123 has Vt = 0.6 V, kn = 5 mA/V2, and VA = 60 V. The signal vsig has a zero average. (a) It is required to bias the transistor to operate at an overdrive voltage VOV = 0.2 V. What must the dc voltage at the drain be? Calculate the dc drain current ID taking into account VA. Now, what value must the drain resistance R D have? (b) Calculate the values of gm and ro at the bias point established in (a). (c) Using the small-signal equivalent circuit of the amplifier, show that the voltage gain is given by

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images - **7.123 The MOSFET in the amplifier circuit of Fig. P7.123 has Vt = 0.6 V, kn = 5 mA/V2, and VA = 60 V. The signal vsig has a zero average. (a) It is required to bias the transistor to operate at an overdrive voltage VOV = 0.2 V. What must the dc voltage at the drain be? Calculate the dc drain current ID taking into account VA. Now, what value must the drain resistance R D have? (b) Calculate the values of gm and ro at the bias point established in (a). (c) Using the small-signal equivalent circuit of the amplifier, show that the voltage gain is given by

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