stabilityandcompensationII

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Unformatted text preview: Adaptive Integrated Microsystems Stability and Frequency compensation Part II (Chapter 5) ECE 412 Introduction to mixed-signal circuits (Fall 2007) Class website: http://www.egr.msu.edu/classes/ece412/shantanu Adaptive Integrated Microsystems How to calculate the phase shift ? Use bode plot to approximately calculate the magnitude and phase response. ) 1 ( ) ( ϖ β s A s H + = Magnitude changes by -20dB/dec for a pole and by +20dB/dec for a zero. -- + -- + pole zero RHP zero LHP pole zero RHP zero LHP changes phase 90 90 90 10 45 45 45 1 . ϖ ϖ ϖ Phase change Adaptive Integrated Microsystems Examples of stable and unstable System For the condition 180 ) (- ≤ ∠ ϖ β j H 1 | ) ( | = ϖ β j H | ) ( | log 20 10 = ϖ β j H For a magnitude 180 ) (- ∠ ϖ β j H 1 | ) ( | = ϖ β j H | ) ( | log 20 10 = ϖ β j H Adaptive Integrated Microsystems Frequency compensation (a) Minimize the number of poles in the signal path. Choice of appropriate circuit topology. (a) Move the dominant pole closer to origin (Reduce the bandwidth). Adaptive Integrated Microsystems Compensation of two stage amplifiers What kind of amplifier is formed by transistors M10 and M12 ? What is the gain of this amplifier ? How many poles and how many zeros does this amplifier have ? Which node will contribute to the dominant pole ?...
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