Discussion5

# Discussion5 - id = 50 k Ω R o = 880 Ω and unloaded...

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Dept. of Electrical and Computer Engineering University of Minnesota EE3115 Fall 20 10 Discussion Problem # 5 Not to be turned in. 1. An amplifier is needed in the circuit shown below. The requirement is that R in = 10 M and that R out be << 2 k although the exact value of R out is not critical. o V + - 2 k ! 100 k ! + - V s R in R out Amplifier The only amplifier available for use for this application is the amplifier shown below. Negative feedback around the amplifier is to be used to meet the application requirements. 10V -10V 50k ! 46k ! 22k ! 10k ! 93k ! 50k ! o V 2 V 1 V Q1 Q2 Q3 Q4 Q5 + - The open loop amplifier (without feedback circuit loading) can be modeled as having an input resistance R

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Unformatted text preview: id = 50 k Ω , R o = 880 Ω , and unloaded voltage gain of A v = 11,000. 1. Specify the type of negative feedback to be used, i.e. shunt-series etc. 2. Sketch the feedback circuit complete with numerical values and indicate where it connects into the open loop amplifier shown above (not the equivalent circuit). 3. Determine the closed loop gain V o /V s and output resistance R out . Assume the feedback network does not load the open loop amplifier. 4. Justify the assumption in step #3 that the feedback network does not load the open loop amplifier. Discussion Problem # 5 Solutions EE3115 Fall 20 10...
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Discussion5 - id = 50 k Ω R o = 880 Ω and unloaded...

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