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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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- Spring '08
- Trigraph, Voltmeter, source voltage requirement, DC electronic voltmeter