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Homework Assignment 6

# Homework Assignment 6 - out =39 A V =0.56 Fig 6-2 R E R x R...

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1 NATIONAL UNIVERSITY of SINGAPORE Department of Electrical and Computer Engineering EE2005 – Electronics Homework Assignment #6 (No need to hand in the homework assignment) 1. Assume the AC small signal parameters for BJT are g m,Qi , r π ,Qi , r o,Qi , and the AC small signal parameters for MOSFET are g m,Mj , r i,Mj , r o,Mj , where i and j are the corresponding device index. Write down the small signal AC driving point resistance (R x ) of the following configuration: 10V R D R x Hint: No body effect M 1 10V R S R x Hint: No body effect M 1 R x M 1 R S C S

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2 2. Consider the emitter follower shown in Fig. 6-2, and assume that DC voltage of V S is 2V and β =100. (a) Find the DC biasing current of the transistor, and the AC small signal parameter of the transistor. (b) Identify the two-ports network, and find its equivalent parameters, R in , R out and A V (v out /v s ). You might assume the following device characteristics: I S =10 -15 A, V A =100V and β =100. (Ans : (a) I C =644 μ A, g m,Q1 =25.8m, r π ,Q1 =3.9k, r o,Q1 =155k, (b) R in =8.9k, R
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Unformatted text preview: out =39, A V =0.56) Fig. 6-2 R E R x R S Q 1 v s 10V R E R x R S Q 1 10V R E R x R S Q 1 R E 2000 Ω R L 50 Ω R S 100 Ω Q 1 C out v s 10V v i v e v out V S =2V 3 3. Consider the common-gate amplifier shown in Fig. 6-3, and assume that K=2mA/V 2 , V TH =1V and no body effect. (a) Find the DC bias current and AC small-signal parameters for the transistor. (Ans : I D,M1 =9m, r o,M1 = ∞ , g m,M1 =8.5m) (b) Identify the source, load and two-ports network, find the two-ports network parameter, R in , R out and G m . (Ans : R in =74, R out =1k, G m =-8.5m) (c) Find the transresistance v o /i s . (Ans : 629) (d) Write down the netlist of the schematic in Fig. 6-3. (e) What is your simulated transresistance v o /i s ? You might use the following model for your simulation : .model Nlarge_mos NMOS level=1 w=2043u l=10.6u vto=1 tox=100n lambda=0 cgdo=245p Fig. 6-3 R S 10k Ω i s R B 200 Ω-5V 10V R D 1k Ω v o C in 1 μ F M 1...
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Homework Assignment 6 - out =39 A V =0.56 Fig 6-2 R E R x R...

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