# q10 - v o as a function of the small-signal input voltage v...

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ECE 3050 Analog Electronics Quiz 10 October 28, 2009 Professor Leach Name Instructions. Print your name in the space above. Place a box around your answers. Points will be subtracted if you do not express each numerical answer as a decimal number and if you do not put a box around answers. Honor Code Statement: I have neither given nor received help on this quiz. Initials 1. The f gure shows a common-drain ampli f er with body e f ect. It is given that r 0 =50k and g m =2mA / V for each MOSFET. For M 1 ,i ti sg iv entha t g mb =0 . 5mA / V . Reference equations: r s = g 1 m , r sb = g 1 mb , g mb = χg m , r 0 s = r s / (1 + χ ) (a) Solve for the small-signal Norton current i o ( sc ) as a function of the small-signal input voltage v i . i o ( sc ) = v i 1+ χ r 0 s = g m v i =0 . 002 v i = v i 500 (b) Solve for the output resistance r out . r out = r o 1 k r 0 s 1 k r o 2 =394 (c) A load resistor R

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Unformatted text preview: v o as a function of the small-signal input voltage v i . Draw and label any circuits you use to solve for v o . v o = i o ( sc ) r out k R L = 0 . 73 v i 1 2. It is given that v i = 2V , R 1 = 10k , R 2 = 20k , R 3 = 6k , and R 4 = 4k . (a) Solve for the current i . Hint: write a single loop equation through the virtual short circuit. i = v i R 1 + R 3 = 1 8 mA = 0 . 125mA (b) Use the results of the preceding part to solve for v o and the voltage at each of the other 4 nodes in the circuit. v o i ( R 2 + R 4 ) = 3V v + = v = iR 4 = . 5V v R 3 = i ( R 3 + R 4 ) = 1 . 25V v R 1 = v R 3 + v i = 0 . 75V 2...
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## This note was uploaded on 05/26/2011 for the course ECE 3050 taught by Professor Hollis during the Summer '08 term at Georgia Institute of Technology.

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q10 - v o as a function of the small-signal input voltage v...

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