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Unformatted text preview: Ω . It is connected to a negative feedback circuit with β = .01. a. Which type of feedback topologies are needed? Sketch the block diagram showing the forward and feedback connections (sampling and mixing types). b. Which of the four amplifier types must the feedback amplifier be? c. Find A fb , R in , R out , if r inβ = r outβ = 1M Ω . 4. An opamp has an openloop dc gain of 80 dB and openloop poles at 1, 10 5 , and 10 7 Hz. If the opamp is connected as a unitygain follower, the circuit will be stable. Find the gain and phase margins. Draw a bode plot of the gain and phase for plot for a unitygain opamp. (Hint: A unity gain opamp circuit is a form of a feedback network where β = 1)....
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 Spring '06
 Audiffred
 Negative feedback amplifier, Nyquist plot, gain open loop, c. Find Afb

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