Please answer all with brief explanation The bandwidth of an amplifier configured with negativefeedbackincreasesdoes not change at alldecreasesThe phase margin m of a 3-pole amplifier configuredin negative feedback can be improved byplacing the secondary pole at higher frequencies Oplacing the dominant pole at higher frequenciesplacing the secondary pole at lower frequenciesplacing the dominant pole at lower frequenciesIf the feedback network of an amplifier is subtracting acurrent signal, its closed loop input impedance willdecreasestay the sameincreaseIf the feedback network of an amplifier is sampling acurrent signal, its closed loop output impedance willincreasedecreasestay the same

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The bandwidth of an amplifier configured with negative feedback increases does not change at all decreases

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.3P

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Concept explainers

Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

Question

Please answer all with brief explanation

The bandwidth of an amplifier configured with negative
feedback
increases
does not change at all
decreases
The phase margin m of a 3-pole amplifier configured
in negative feedback can be improved by
placing the secondary pole at higher frequencies O
placing the dominant pole at higher frequencies
placing the secondary pole at lower frequencies
placing the dominant pole at lower frequencies
If the feedback network of an amplifier is subtracting a
current signal, its closed loop input impedance will
decrease
stay the same
increase
If the feedback network of an amplifier is sampling a
current signal, its closed loop output impedance will
increase
decrease
stay the same

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