m2_320a00 - V GQ = 2 1 V The transistor has properties K =...

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EE 320 Autumn 2000 Prof. Clymer Midterm 2 November 17, 2000 50 minutes Please write out the EE Honor Code Pledge: “No aid given, received or observed,” on this exam booklet and sign your name before turning in your exam.
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EE 320, Midterm 2–Nov. 17, 2000 2 1.) (30 pts) The unity gain voltage bufer op amp circuit discussed in class (called the voltage Follower in the text) “eliminates loading efects.” In your own words , describe what this means and use the two example circuits below to demon- strate the diference between a case where loading has an efect and a case where the loading efect is absent. v 1 + + R 1 v 0 + Circuit 1 v 1 R 1 v 0 + _ R L R L Circuit 2 +
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EE 320, Midterm 2–Nov. 17, 2000 3 2.) (35 pts) In the amplifer circuit shown below, R G = 200 Ω, R 1 = 4 KΩ, R D = 5 KΩ and C L = 2 μ F. The input is a sinusoidal source ( ω = 400 radians/s) with a phasor representation ˜ V in which has a phase o± 0 o . The current source, I 1 , is a dc source. The transistor operates in pinch-o² mode and dc analysis shows that the dc gate voltage is
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Unformatted text preview: V GQ = 2 . 1 V. The transistor has properties K = 0 . 001 A/V 2 , λ = 0 . 0001 V-1 , and V t = 0 . 8 V. (You do not need values ±or V DD or I 1 to solve the problem.) a.) Find values ±or g m and r o . b.) Draw a small signal ac circuit ±or the amplifer. c.) Find the voltage gain (magnitude and phase), A v = ˜ V o / ˜ V in . v o + _ R 1 C L v in V DD I 1 R D R G ~ + – Circuit for Problem 2. EE 320, Midterm 2–Nov. 17, 2000 4 (blank page for calculations) EE 320, Midterm 2–Nov. 17, 2000 5 3.) (35 pts) For the linear amplifer circuit shown below, R 1 = 1 KΩ, R 2 = 2 KΩ, R 3 = 3 KΩ, R 4 = 4 KΩ, R 5 = 5 KΩ, R 6 = 6 KΩ, R 7 = 7 KΩ. Find the voltage gain, A v = ˜ V o / ˜ V 1 . + – + – ~ V o ~ + – R 1 ~ V 1 R 2 R 3 R 4 R 5 R 6 R 7 Circuit for Problem 3. EE 320, Midterm 2–Nov. 17, 2000 6 (blank page for calculations)...
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m2_320a00 - V GQ = 2 1 V The transistor has properties K =...

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