Lecture 15-Loop gain simulation

Lecture 15-Loop gain simulation - Lecture 15 Loop Gain...

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EE 214 Lecture 15 (HO#21) B. Murmann 1 Lecture 15 Loop Gain Simulation Boris Murmann Stanford University [email protected] Copyright © 2004 by Boris Murmann
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EE 214 Lecture 15 (HO#21) B. Murmann 2 Overview Introduction – Last lecture, we've seen that return ratio analysis is a useful tool for characterizing feedback amplifiers in terms of stability, bandwidth and static precision. Since we are always interested in verifying our hand analysis results using simulations, it is desirable to have an equivalent method available in Spice. In this lecture, we will discuss the so called Middlebrook method for loop gain simulation. This particular approach helps overcome the issue that ideal loop breakpoints, e.g. at controlled sources, are not directly accessible in Spice.
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EE 214 Lecture 15 (HO#21) B. Murmann 3 References H.W. Bode, Network Analysis and Feedback Amplifier Design , Van Nostrand, New York, 1945. R.D. Middlebrook, “Measurement of Loop Gain in Feedback Systems, “ Int. J. Electronics, Vol. 38, No.4, .pp. 485-512, 1975. S. Rosenstark, “Loop Gain Measurement in Feedback Amplifiers, “ Int. J. Electronics, Vol. 57, No.3., pp. 415-421, 1984. P.J. Hurst, “Exact Simulation of Feedback Circuit Parameters, “ Trans. on Circuits and Systems, pp.1382-1389, Nov. 1991. P.J. Hurst, S.H. Lewis, “Simulation of Return Ratio in Fully Differential Feedback Circuits, “ Proc. CICC 1994, pp.29-32. Ken Kundert, "A Test Bench for Differential Circuits, Online: http://www.designers-guide.com/Analysis/diff.pdf
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EE 214 Lecture 15 (HO#21) B. Murmann 4 Circuit Example 1 What is the loop gain in this circuit? freq, Hertz C s C f V o R f V DD V i
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B. Murmann 5 Return Ratio Analysis As we've seen last lecture, such a hand calculation is pretty straightforward How can we simulate T(j ω
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This note was uploaded on 01/16/2011 for the course EE 214 taught by Professor Murmann,b during the Spring '04 term at Stanford.

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Lecture 15-Loop gain simulation - Lecture 15 Loop Gain...

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