The MOSFET\'s parameters are: VT=1.0V and K=0.017A/V2. The resistance of the loa

Question

The MOSFET's parameters are: VT=1.0V and K=0.017A/V2. The resistance of the load resistor RL=120.0?.

1) 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 VG, in Volts, needed to keep the MOSFET out of cutoff?

2) Assume VG=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?

3) Choose the operating point where the input bias voltage VIN=0. Now we go to a small-signal model: what is the transconductance gm, in Amperes/Volt, of the MOSFET at the chosen operating point?

4) What is the incremental gain vout/vin of this circuit at the chosen operating point? Be careful with signs here.

5) What is the equivalent incremental input resistance, in Ohms, of this small-signal model? Note that the incremental input resistance is vin/iin, where iin is the current taken from the input voltage source for the voltage vin.

The MOSFET's parameters are: VT=1.0V and K=0.017A/V2. The resistance of the load resistor RL=120.0?. 1) 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 VG, in Volts, needed to keep the MOSFET out of cutoff? 2) Assume VG=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? 3) Choose the operating point where the input bias voltage VIN=0. Now we go to a small-signal model: what is the transconductance gm, in Amperes/Volt, of the MOSFET at the chosen operating point? 4) What is the incremental gain vout/vin of this circuit at the chosen operating point? Be careful with signs here. 5) What is the equivalent incremental input resistance, in Ohms, of this small-signal model? Note that the incremental input resistance is vin/iin, where iin is the current taken from the input voltage source for the voltage vin.

Explanation / Answer

While I agree that your solution to part 2 should work, it is not accepted as correct. Any thoughts.

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