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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 in-β = r out-β = 1M Ω . 4. An op-amp has an open-loop dc gain of 80 dB and open-loop poles at 1, 10 5 , and 10 7 Hz. If the op-amp is connected as a unity-gain 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 unity-gain op-amp. (Hint: A unity gain op-amp circuit is a form of a feedback network where β = 1)....
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- Spring '06
- Negative feedback amplifier, Nyquist plot, gain open loop, c. Find Afb