27_Lecutre

27_Lecutre - EE 114 Lecture 27 R. Dutton, B. Murmann 1...

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Unformatted text preview: EE 114 Lecture 27 R. Dutton, B. Murmann 1 EE114 (HO #31) Lecture 27 Loop Gain Simulation R. Dutton, Boris Murmann Stanford University R. Dutton, B. Murmann 2 EE114 (HO #31) 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 M. Tian, V. Visvanathan, J. Hantgan, K. Kundert, "Striving for small-signal stability," IEEE Circuits and Devices Magazine, pp. 31-41, January 2001. R.D. Middlebrook, "The General Feedback Theorem A final solution for feedback systems, http://ardem.com/free_downloads.asp R.D. Middlebrooks Yahoo group, http://groups.yahoo.com/group/Design- Oriented_Analysis_D-OA/ Frank Wiedmanns material on Loop Gain Simulation, http://www.geocities.com/frank_wiedmann/loopgain.html EE 114 Lecture 27 R. Dutton, B. Murmann 3 EE114 (HO #31) Circuit Example What is the loop gain in this circuit? C s C f V o R f V DD V i R. Dutton, B. Murmann 4 EE114 (HO #31) Return Ratio Analysis As we've in previous lectures, such a hand calculation is pretty straightforward How can we simulate T(j ) in Spice? Using "real" transistor models C s v o v x C f C x r o g m v x i t i r R f ( ) t r i i s T ! = EE 114 Lecture 27 R. Dutton, B. Murmann 5 EE114 (HO #31) Spice MOSFET AC Simulation Model Nodes of ideal controlled source are not accesible! Cannot break loop at g m generator R. Dutton, B. Murmann 6 EE114 (HO #31) Popular Simulation Approach Inaccurate Hard to estimate mock load May get different results for different breakpoints Ideally, we'd like to avoid all...
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This note was uploaded on 11/02/2011 for the course EE 114 taught by Professor Murmann during the Fall '08 term at Stanford.

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27_Lecutre - EE 114 Lecture 27 R. Dutton, B. Murmann 1...

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