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q08 - when solving for i o sc Then assume r 01 = r 02 = 50k...

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ECE 3050 Analog Electronics Quiz 8 March 4, 2009 Professor Leach Name Instructions. Print your name in the space above. Honor Code: I have neither given nor received help on this quiz. Initials The fi gure shows a cascode ampli fi er. M 1 is operated as a CS ampli fi er with a small-signal voltage v s and a dc bias voltage V B 1 applied to its gate. M 2 is operated as a CG ampli fi er with a dc bias voltage V B 2 applied to its gate. M 3 and M 4 form a current mirror with an input dc current I REF . For each MOSFET, it is given that g m = 1 / 200 , g mb = 1 / 400 , and r 0 = 50 k . Solve for i o ( sc ) and v o ( oc ) . To simplify the solution, assume r 01 = r 02 =
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Unformatted text preview: when solving for i o ( sc ) . Then assume r 01 = r 02 = 50k Ω when using i o ( sc ) to calculate v o ( oc ) . χ = g mb g m r s = 1 g m + g mb = 1 g m (1 + χ ) r id = r μ 1 + R ts r s ¶ + R ts g m 1 200 g mb 1 400 χ g mb g m χ 0.5 = r 50000 v s 1 i' d1 g m v s . i' d2 i' d1 i sc i' d2 i sc 5 10 3 = r' s2 1 g m 1 χ ( ) . r' s2 1.333 10 2 = R ts2 r r id2 r 1 R ts2 r' s2 . r r id2 1.885 10 7 = v oc i sc R p2 r r id2 , . v oc 2.493 10 2 = Answers are i sc / v s and v oc / v s . 1...
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