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su10q05

# su10q05 - the transistor source and χ = 0 25(a r is 1 = r...

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ECE 3050 Analog Electronics Quiz 5 June 23, 2010 Professor Leach Name Instructions. Print your name in the space above. Honor Code: I have neither given nor received help on this quiz. Initials 1. Shown is the circuit diagram of a transconductance ampli fi er. Assume all transistors are matched, β = , α = 1 , and r 0 = . Next to the arrows, label the small-signal current in terms of i c 1 and solve for i o in terms of i c 1 . i o = 2 i c 1 see class notes for solution 1

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2. The ac signal circuit of a CG/CD ampli fi er is shown. Given R D = 20 k , R S = 1 . 6 k , g m = 2 . 5 mS , and r 0 = . (a) Solve for the numerical value of the voltage gain A v = v o /v i , the input resistance r in , and the output resistance r out . (b) Solve for the new answers if the body of each transistor is connected to signal ground (rather than to
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Unformatted text preview: the transistor source) and χ = 0 . 25 . (a) r is 1 = r is 2 = 1 g m = 400 Ω v o v i = i s 1 v i × i d 1 i s 1 × v tg 2 i d 1 × v o v tg 2 = − 1 r is 1 × 1 × − R D × R S r is 2 + R S = 1 400 × 20000 × 1600 400 + 1600 = 40 r in = r is 1 = 400 Ω r out = r s 2 k R S = 320 Ω (b) r is 1 = r is 2 = 1 (1 + χ ) g m = 320 Ω v o v i = i s 1 v i × i d 1 i s 1 × v tg 2 i d 1 × v o v tg 2 = − 1 r is 1 × 1 × − R D × 1 1 + χ R S r is 2 + R S = 1 320 × 20000 × 1 1 . 25 1600 320 + 1600 = 41 . 7 r in = r s 1 = 320 Ω r out = r is 2 k R S = 266 . 7 Ω 2...
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su10q05 - the transistor source and χ = 0 25(a r is 1 = r...

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