HW 8 ans - (c) Calculate a value for g m . (d) Draw the...

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fwphelps@syr.edu - icl.syr.edu ELE232 – Electrical Fundaments II – 28MAR2008 Homework 8 - Due: Friday, 4APR2008 Problem 1 : This is a circuit for a simple DC electronic voltmeter. The DC micro-ammeter M reads 200 μ a full scale and has zero resistance. I DSS = 4ma , and V P = - 3v . (a) For the meter M to read zero when V in = 0 , what should be the size of R ZERO ? (b) When the meter reads full scale, the current I D = 1.3ma . What must be the size of V in if R ZERO has the value found above and R CAL = 0 . (a) VGS = 0v . The voltage on the RHS of the meter is 10v . The current will be zero if the voltage on the LHS of the meter is also 10v . A drain current of 1ma will make that happen [ i.e. 20v – I D (10K)] . 1 ma = 4 ma 1 + V GS 3 ! " # $ % 2 . V GS = ! I D R ZERO = ! 1 ma ( ) R ZERO = 4 1 ma 4 ma ! 1 " # $ % = ! 2 v . R ZERO = 2K .
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fwphelps@syr.edu - icl.syr.edu Problem 2 : The desired quiescent operating point for this amplifier is [ I D = 1.5ma, V DS = 6v ] . (a) Choose R S so that the drain current requirement is met. (b) Choose R d so that the drain to source voltage requirement is met.
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Unformatted text preview: (c) Calculate a value for g m . (d) Draw the small signal equivalent circuit . (e) Calculate the size of the pass-band gain. (f) Determine C IN to make the cutoff frequency 1000 r/s (assume C S is large enough to behave like a short-circuit .) Problem 3 : The voltage divider formed by R 1 , R 1 and V DD provides a positive voltage to the gate of the JFET. R S is chosen so as to overcome that and make V GS < 0v . (a) Find the sized of the positive voltage produced by the voltage divider. (b) Calculate the size of V GS that will make I D = 2ma . (c) Determine the size of R S needed to produce that value for V GS . Choose R d so that V DS is 6v . (e) Draw the small-signal equivalent circuit valid in the pass-band . Calculate the size of the pass-band gain A V (ignore r d .) (f) Assume C S is large enough to act like a short-circuit in the small signal-equivalent circuit . Determine the cutoff frequency produced by C IN ....
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This note was uploaded on 05/02/2008 for the course ELE 232 taught by Professor Phelps during the Spring '08 term at Syracuse.

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HW 8 ans - (c) Calculate a value for g m . (d) Draw the...

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