Homework Assignment 10 Solution

# Homework Assignment 10 Solution - NATIONAL UNIVERSITY of...

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1 NATIONAL UNIVERSITY of SINGAPORE Department of Electrical and Computer Engineering EE2005 – Electronics Homework Assignment #10 Solution 1. Assume the following MOSFET parameters and ignore body effect: NMOS : K N =2mA/V 2 , V THN =0.5V, C gd =4pF and C gs =1.6pF. a) Select I bias to get overall gain (v o /v s ) of -10. (3 marks) b) Design R A1 and R B1 so that V G,M1 =V D,M1 ? (2 marks) c) Choose all the DC block/bypass capacitor value to have f L equal to 200Hz. (3 marks) d) Can Miller Theorem be applied? Estimate the f U of this amplifier. (3 marks) e) An engineer has commented that the f U can be increased while maintaining the same gain at the expense of more I bias . Comment on the validity of the above statement. (3 marks) f) Create the netlist for this amplifier for simulation. (3 marks) g) What are the simulated gain, f L and f U ? (3 marks) Use PSPICE and the following model to verify your results. .model Nsimple_mos NMOS level=1 w=1156u l=6u vto=0.5 tox=100n lambda=0.0 +cgdo=3.46n a) A I mA g I K V mA g R g A R R R Assume M D M m M D n M m L M m V S B A μ 125 1 4 / 1 10 // 1 , 1 , 1 , 1 , 1 , 1 1 = = = = = = >> b) k R and k R R R R R R R R R Assume R I V R R R V B A S S A B B A B A L M D M D A B B M G 5 . 160 7 . 10 100 // 75 . 18 20 20 1 1 1 1 1 1 1 1 1 , 1 , 1 1 1 1 , = = >> = + = = = = × + = c) C E C in R S 0.1k Ω v s 20V R A1 R B1 I bias M 1 R L 10k Ω v out

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2 F C Choose C on depends only f C to comparable is C if R R Since F C s f dominates R C g sees C k sees C f dominate would smallest b f in E L E i eqCi eqCE E CE CE L eqCE E CE M m E in L i i L μ τ πτ π 1 796 . 0 796 200 2 1 1 10 ~ 1 2 1 2 1 , 1 = << = = = = Ω = = d) () () () () MHz f ns k k R R g R R ps R
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Homework Assignment 10 Solution - NATIONAL UNIVERSITY of...

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