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Lecture 17-Compensation and Two Stage OTA

Lecture 17-Compensation and Two Stage OTA - Lecture 17...

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EE 214 Lecture 17 (HO#25) B. Murmann 1 Lecture 17 Compensation Two-Stage OTA Design Considerations Boris Murmann Stanford University [email protected] Copyright © 2004 by Boris Murmann
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EE 214 Lecture 17 (HO#25) B. Murmann 2 Overview Reading 9.4.1, 9.4.2, 9.4.3 (Compensation) Introduction In this lecture, we will continue to look at the pole splitting technique as a method for achieving sufficient phase margin in a two-stage amplifier. While using a Miller capacitance for compensation helps move the non-dominant pole to higher frequency, it also introduces an undesired zero in the transfer function. Today, we'll discuss several options on how to cope with this artifact. In addition, we will review a possible design strategy for two- stage OTAs. Since there exist many degrees of freedom in this topology, a thorough hand analysis is essential, and can help minimize, if not completely eliminate, the time needed for a large number of Spice iterations.
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