23_Lecutre

23_Lecutre - Lecture 23 EE 114 Lecture 23 OTA Feedback...

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EE 114 Lecture 23 R. Dutton, B. Murmann 1 EE114 (HO #27) Lecture 23 OTA Feedback Circuits (Part I) R. Dutton, B. Murmann Stanford University R. Dutton, B. Murmann 2 Classification of “OpAmps” (1) Type – Operational Amplifier • Ideally a voltage-controlled voltage source • Typically contains an output stage that can drive “arbitrary” loads, including small resistances • Predominantly used for board-level circuitry – Operational Transconductance Amplifier (OTA) • Ideally a voltage controlled current source • Typically restricted to capacitive (or moderate resistive) loads • Primarily used in integrated circuits EE114 (HO #27)
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EE 114 Lecture 23 R. Dutton, B. Murmann 3 Classification of “OpAmps” (2) Output configuration – Single ended – Differential • Predominantly used for integrated high-performance or high- precision amplifiers • Requires common mode feedback circuit – Class-A • Output cannot source/sink currents larger than quiescent point bias current – Class-AB • Output can provide large drive currents “on demand” EE114 (HO #27) R. Dutton, B. Murmann 4 Topics EE114 – Class-A OTAs with single ended outputs – Overview of commonly used architectures • Telescopic OTA, Folded Cascode OTA, Current Mirror OTA, Two-stage OTA – Frequency response and stability in capacitive feedback configuration EE315A – Continuous-time and switched-capacitor filters using fully differential OTAs – Analysis of noise performance – Analysis of transient behavior – Design methodology for short-channel technologies EE114 (HO #27)
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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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23_Lecutre - Lecture 23 EE 114 Lecture 23 OTA Feedback...

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