Question

solve each part separately and indicate answer to each part clearly.

The circuit shown below is called a "common gate amplifier": the input is applied to the source rather than the gate of the MOSFET. As usual, however, the MOSFET is biased so that it is operated in saturation. RL. 'IN Figure 1-1 The MOSFET's parameters are: Vr = 0.9V and K 0.018A/V2. The resistance of the load resistor RL 220.082 If in the application of this circuit the input voltage viN may swing between 1.0V and 2.0V, what is the minimum value of the bias voltage Vc, in Volts, needed to keep the MOSFET out of cutoff? Ceet nu ed Assume Vc 3.0V, and the input swing is as specified. What is the minimum value of the power- supply voltage VDD, in Volts, needed to keep the MOSFET in saturation? Choose the operating point where the input bias voltage VIN0 Now we go to a small-signal model: what is the transconductance gm, in Amperes/Nolt, of the MOSFET at the chosen operating point? What is the incremental gain a of this circuit at the chosen operating point? Be careful with signs here. vout in What is the equivalent incremental input resistance, in Ohms, of this small-signal model? Note that the incremental input resistance S i , where iin is the current taken from the input voltage source for the voltage

Answer 1

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