Question: [ 2 0 pts ] Consider a feedback amplifier for which the open - loop gain A ( s ) is given by A (

[20pts] Consider a feedback amplifier for which the open-loop gain A(s) is given by
A(s)=1000(1+S10000)4
If the feedback factor is independent of frequency, find the frequency at which the phase shift is 180(10pts), and find the critical value of at which oscillation will commence (10 pts ).
[ 2 0 pts ] Consider a feedback amplifier for

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