HW 10 ans

# HW 10 ans - [email protected] icl.syr.edu ELE232 Electrical...

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[email protected] – icl.syr.edu ELE232 – Electrical Fundamentals II – 28APR2008 Answers to Homework 10 Problem 1 : (a) Find the operating point for this circuit analytically. (b) The turned-on base-emitter junction has (in addition to a 0.6v diode drop) a resistance r b that plays a big role in the small signal equivalent circuit. Determine a value for r b . (a) I B = V TH ! 0 . 6 R TH , where V TH = 30 K 30 K + 270 K 20 v = 2 . 0 v , and R TH = 30 K( 270 K) 30 K + 270 K = 27 K . I B = 2 . 0 ! 0 . 6 27 K = 52 μ a . V CE = 20 v ! ( 220 ) 52 μ a( 1 K) = 8 . 6 v . (b) r b = 1 40 v ! 1 (I B ) = 481 " Problem 2 : (a) Add an input voltage source to the circuit above. (b) Draw the small-signal equivalent circuit for this circuit. (c) Find an expression for the frequency response of this amplifier H ( j ! ) = v 0 ( j ! ) v 1 ( j ! ) . (d) Find numbers for the cutoff frequency ω C and the pass-band gain A Vo . (b)

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HW 10 ans - [email protected] icl.syr.edu ELE232 Electrical...

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