ucsb · 2016. 5. 27. · mid-term exam, ece-137b tuesday, may 3, 2016 closed-book exam there are 2...
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Problem 2, 25 points
R dl
Rgen
vgen
R
\( cC j R isi sz. LL
In the amplifier above,Rgen=100kOhm, Rgla=Rglb=500kOhm,Rsl=Rs2=100 Ohms. VDD=5Voltsgml=5 mS, gm2=10mSRdl=l kOhm, Rd2=2kOhm, RL=10kOhm.Cin, Cout, Csl, Cs2 are all very largeCgsl=OfT, Cgld=5fF, Cgs2=0 fF, Cgd2=10fFGdsl=Gds2=OmSPart a: 4 pointsdraw below a small-signal representation of the circuit, but with the transistorsrepresented by transistor symbols, not small-signal hybrid-pi models
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Part b, 6 pointsFind the small-signal voltage gain of the two stages:
Voutl/Vinl=Vdl/Vgl=Vout/Vin2=Vd2/Vg2-=
V, —-L|rwr
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Part c. 1 0 pointsusing the method of time constants, find al and a2 of the circuit transfer function:
ai=a2=
RXT
-f
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Part d, 5 points
There may be either 1 or 2 poles of the transfer function.
If the poles are real^ give the 1 or 2 rjo.|e frequencies in Hz:/„=.If there are 2 poles, and they are complex, give fn = con I In and the damping factor £ :
f
^P^>-J
Jff=- •>f&A,
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Part d, 5 points
Can you describe the behavior of Z(s) in terms of a simpler equivalent circuit ?
-to
bdwes. li
2 = }/Q
open,
In Jmli\j , C fcko, ^
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