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Get Full Access to Microelectronic Circuits - 6 Edition - Chapter 10 - Problem 10.45
Get Full Access to Microelectronic Circuits - 6 Edition - Chapter 10 - Problem 10.45

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# Figure P10.45 shows a feedback triple utilizing MOSFETs. ISBN: 9780195323030 147

## Solution for problem 10.45 Chapter 10

Microelectronic Circuits | 6th Edition

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Problem 10.45

Figure P10.45 shows a feedback triple utilizing MOSFETs. All three MOSFETs are biased and sized to operate at mA/V. You may neglect their s (except for the calculation of as indicated below).(a) Considering the feedback amplifier as a transconductance amplifier with output current , find the value of that results in a closed-loop transconductance of approximately 100 mA/V. (b) Sketch the A circuit and find the value of (c) Find and Compare to the value of you designed for. What is the percentage difference? What resistance can you change to make exactly 100 mA/V, and in which direction (increase or decrease)? (d) Assuming that k find the output resistance . Since the current sampled by the feedback network is exactly equal to the output current, you can use the feedback formula. (e) If the voltage is taken as the output, in which case the amplifier becomes seriesshunt feedback, what is the value of the closed-loop voltage gain ? Assume that has the original value you selected in (a). Note that in this case should be considered part of the amplifier and not the feedback network. The feedback analysis will reveal that changes somewhat, which may be puzzling given that the feedback loop did not change. The change is due to the different approximation used. (f) What is the closed-loop output resistance of the voltage amplifier in (e) above?

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