MSD630_HW1

# MSD630_HW1 - nodes V o1 and V o2 are also exactly at V DD...

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MSD630 Spring 2010 Page 1 of 2 HOMEWORK #1 (Due: Sunday, March 21, 2010, 6pm) You will not need (and should not use) Spice for any part of this problem set. Use simple long channel MOS models in all problems. Ignore finite output resistance (in the forward active region) and body effect. 1. Text, Problem 2.12. 2. Text, Problem 2.18. 3. Derive the equation at the bottom of slide 8, lecture 2 by differentiating the large signal transfer function of the common source amplifier (slide 5). 4. In the common source stage shown below, the MOS device is purposely biased to operate in the triode region. Derive an expression for the low frequency small signal gain v o /v i as a function of the device’s quiescent point voltages V GS and V DS . Comment on the achievable gain. v o v i 5. Consider the two-stage amplifier shown below. a) Draw an equivalent small signal model for this circuit. b) Calculate the low-frequency small signal gains v o2 /v i and v o1 /v i . Assume that V B =V DD /2 and that the device sizes are chosen such that the DC bias points of

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Unformatted text preview: nodes V o1 and V o2 are also exactly at V DD /2. You are also given V tn =|V tp |=0.5V, and V DD =2.5V. Note that you do NOT need any device parameters to solve this problem. MSD630 Spring 2010 V B V DD Page 2 of 2 v i V o2 V o1 6. Spice models. a) Using the HSpice manual, find out how many model parameters are used in the so-called “LEVEL1 Schichman-Hodges” MOSFET model. This model essentially corresponds to the simple MOSFET equations derived in class. b) Take a look at the MSD630 model file msd630_hspice.txt. How many model parameters are used to describe the 0.35µm transistors used in MSD630 (nch630, pch630)? c) Explain the purpose of the parameter “HDIF” used in msd630_hspice.txt. 7. For the circuit below, calculate the small signal transfer function v o (s)/v i (s). Parameters: W 1 =10µm, L 1 =0.35µm, W 2 =10µm, L 2 =10µm, V B =1.5V, V DD =3V, V t =0.6V, C ox =5.3fF/µm 2 , µ=300cm 2 /Vs. V DD v i V B M 1 v o M 2...
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## This note was uploaded on 03/19/2010 for the course ENG 630 taught by Professor Ghonima during the Spring '10 term at Cairo University.

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MSD630_HW1 - nodes V o1 and V o2 are also exactly at V DD...

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