EE114_HW5

EE114_HW5 - EE114 Autumn 08/09 R. Dutton, B. Murmann Page 1...

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EE114 Autumn 08/09 R. Dutton, B. Murmann Page 1 of 3 Last modified 10/24/2008 12:21:00 PM HOMEWORK #5 (Due: Friday, October 31, 2008, noon PT) In this problem set, please refer to EE114 technology device parameters from lecture 7 slide 12 whenever you need device constants in your calculations. 1. Consider the two source follower circuits shown in Fig. 1a and Fig. 1b. a) Suppose that the output voltage swings from 2V to 4.5V in both circuits. Calculate the corresponding voltage swings at the gate nodes, for R L =1k Ω and R L =1M Ω . Determine these values using the transistor’s large signal model. Summarize your results in a table. Explain how different values for R L and how the two different bulk connection schemes effect the required input voltages. b) Draw a small signal equivalent for the circuit of Fig. 1a. Find an analytical expression for the low frequency small signal gain a vo =v o /v i as a function of R L and the DC voltages V I and V O . Calculate the small signal gain at V
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EE114_HW5 - EE114 Autumn 08/09 R. Dutton, B. Murmann Page 1...

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