Homework Assignment 8 Solution - NATIONAL UNIVERSITY of...

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1 NATIONAL UNIVERSITY of SINGAPORE Department of Electrical and Computer Engineering EE2005 – Electronics Homework Assignment #8 Solution 1. Fig. 8-1 A multistage MOSFET amplifier is shown in the Fig. 8-1. You may assume that the body and the source terminals of the NMOS and PMOS are connected together, i.e. no body effect for NMOS and PMOS. You may also assume the following device parameters and all NMOS and PMOS devices are identical: K n =2mA/V 2 , V THN =1V, λ n =0.001V -1 , C gd =0.5pF, C gs =5pF K p =2mA/V 2 , |V THP |=1V, λ p =0.001V -1 , C gd =0.5pF, C gs =5pF a) Design R REF so that the drain currents for M 1 , M 2 and M 3 are 500 μ A. (3 marks) b) Identify the two stage amplifier configuration and estimate the small signal transconductance for transistors M 1 and M 2 . (3 marks) 10V R REF M 3 10V R S 100 v s R in C S 10 μ M 2 v 1 M 1 R B1 100k R 1 R 2 C 2 C 1 C 3 v 2 v out V B =5V 500 μ A ( ) ( ) Ω = = = = = = = = = = k A V R V V V V A V V K V V K I I I GS REF GS GS GS THP GS p THN GS n D D D 17 500 10 5 . 1 500 3 , 3 , 2 , 1 , 2 3 , 2 1 , 3 , 2 , 1 , μ V mA I K g g CS CG D n M m M m / 2 4 2 , 1 , = = =
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2 c) Determine the two ports network parameters for the two stage amplifier, i.e. R in1 , R out1 , G m1 or A v1 , R in2 , R out2 , G m2 or A v2 . (6 marks) d) Assume R 1 =R 2 , design R 1 so that the overall gain (v out /v s ) is -60. (3 marks) e) Create a SPICE netlist and verify your gain result in part (d). You may assume C 1 =C 2 =C 3 =100 μ F in your simulation. (5 marks) R S 100 v s M 2 v 1 M 1 R B1 100k R 1 R 2 v 2 v out R S 100 v s M 2 v 1 M 1 R B1 //R 1 R 2 v 2 v out R in1 R out1 R in2 R out2 G m1 G m2 [] [] [] [] 0 2 // 2 1 // // 2 // 1 / 2 / 2 2 , 2 2 2 1 , 1 , 1 1 1 1 , 1 1 1 , 1 , 1 2 , 2 1 , 1 = = = + = + = = = = = E M o out in S M m M o B out M o B M o M m in M m m M m m R with G ion Configurat Table r R R R G ion Configurat Table R
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This note was uploaded on 10/24/2011 for the course ELECTRICAL ee2021 taught by Professor Tan during the Spring '11 term at National University of Singapore.

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Homework Assignment 8 Solution - NATIONAL UNIVERSITY of...

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