hw07 - ECE 3150 Homework 7 Due 3/27/2009 in the drop box 1....

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ECE 3150 Homework 7 Due 3/27/2009 in the drop box 1. (Simple CS amplifier design) An NMOS amplifier is to be designed to provide an output voltage centered at 1.5V with 0.5V peak-to-peak variation across a R D =50k load in the circuit below. (a) If a small-signal gain of 5V/V is needed, what g m is required if r o of the NMOSFET can be ignored? (2 pts) (b) For V DD =3V, what values of I D and V OV will you choose for the output center point? (4 pts) (c) What W/L ratio is required if k n = μ n C ox = 0.1mA/V 2 ? (2 pts) (d) If V th =0.8V, what is the large-signal V GS and V DS as the Q point? (2 pts) (e) For v O to swing between 1.25V and 1.75V, what is the corresponding v gs swing? (2 pts) Check if the transistor is always in saturation. (2 pts) (f) For v O at 1.25V and 1.75V, what is the g m and A v variation (the non-constant g m here will cause a nonlinear distortion between input and output)? (4 pts) 2. (CS amplifier parameters in different transistor parameter sets) For the CS amplifier above, for R D >> r o (approaching small-signal open-circuit load) and assuming V A is proportional to L (and hence V A ’=V A /L is constant), write down the small signal gain A vo as a function of the following
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hw07 - ECE 3150 Homework 7 Due 3/27/2009 in the drop box 1....

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