# HW_14 - A 400 REF µ = I and . The parameters of the...

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EE 438 Homework #14 Basic FET Amplifiers 1. In the Current Mirror circuit shown below use V DD = 10 V to find (a) the value of R REF that causes I R to equal 400 µ A. (b) If the value of R REF equals that found in (a) what value of R will cause V DS2 = ( V GS2 - V tp ) [this is the value of R that causes Q 2 to be at the edge of saturation and is the largest value of R for which the Current Mirror circuit acts like a current source.] The PMOS transistor parameters are: P M O S : 1 - 2 V 0 , V 2 , 20 , A/V 10 = = = = λ µ tp p p V L W k Q 2 Q 3 V DD R REF R I I R λ = 0 in the DC analysis. Use the given values of λ to determine the values of r o in the signal analysis. Also assume that the substrate for the NMOS transistors is connected to ground and the substrates (n wells) for the PMOS transistors are connected to +

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Unformatted text preview: A 400 REF µ = I and . The parameters of the FET’s are: V 10 = DD V PMOS: 1-2 V 0.01 , V 2 , 20 , A/V 10 = − = = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = ′ p tp p p V L W k NMOS: 1-2 V 0.01 , V 2 , 20 , A/V 20 = = = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ = ′ n tn n n V L W k Using a DC analysis find: (a) V GS2 , (b) I D1 , (c) V BIAS (d) g m1 , (e) r o1 , and (f) r o2 . Draw a small signal equivalent circuit and use a signal analysis to find: (g) the signal voltage gain, i o v v v A = . Basic MOSFET Amplifiers Common Source Amplifier _ + Q 1 Q 2 Q 3 I REF V BIAS v i v O = V O + v o V DD Common Drain Amplifier (Source Follower) _ + v O = V O + v o V DD I REF V BIAS Q 3 Q 2 Q 1 v i Common Gate Amplifier _ + Q 1 Q 2 Q 3 I REF V BIAS v i v O = V O + v o V DD...
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## This note was uploaded on 10/26/2009 for the course EE 438 taught by Professor Cardwell during the Spring '08 term at University of Texas.

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HW_14 - A 400 REF µ = I and . The parameters of the...

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