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Unformatted text preview: 10v
L V A
CC! Ska
701:0 RC} C2
Rt‘Rn
soon CI r
Tl WC‘IICE woRKS‘AE‘ET
(EE 2553 Transistor Specs
Brie! = 250, Baez = 350
$01: B02 7 520
{1:1, "9 = 0.70 for T1 and T2 (Al' G!) : 1'31 ( I] {S «‘50 To)
Tugfake (r, .5 «[50 (Bldg) 6%": 1a. Draw the small—signal hybﬁdn model than is applicable for low, middie, and high fre quencics. 1b. Fill in each entry of the following table with an "S" for shortcircuit, an "0" for open
circuit, or an "E" for exact value to indicate how the capacitor indicated by the row label should
be modeled in the small—signal equivalent circuit for the frequency range indicated by the
column heading. Use the judgment of a good design engineer by using the exact value of the
capacitors only when necessary, i.e., do not choose "E" for every entry. HighFrequency LowFrequency MidFrequency WERE Is. For the Case of high frequency. ﬁnd the equivalent resistance, Rm, seen by the capacitor
labeled Cuz in the smallsignal model. .. . 1d. Estimate the upper half—power frequency, (DH, assuming that the caﬁacitor labeled Cu; in
the small—signal model has the predominant effect in determining that frequency. Express your answer in terms of C”. m _ ._._.___ 1e. For the case of low frequency, the equivalent resistance. Rqu, seen by the capacitor labeled C51 is given by _ rx1+(Rs“ Rtlle)
Reql  Rat H {501 +1  Find the equivalent resistance, qu2, seen by capacitor C52. . lf. Design the circuit so that C51 = CE; and so
fL, satisﬁes 15<fL<30 Hz You may assume at the capacitors C1, C2, and C3 are large enough so that the lower ha1f~power frequency is t predominantly by C5, and C52. lg. For the mid—frequency case. ﬁnd the output impedance 29. 1h. Find the midfrequency voltage gain, Amman. deﬁned by Av. Va
(mid)=“\7: ...
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 Spring '08
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