h30_lecture22_2

h30_lecture22_2 - Lecture 22 OTAs with Single Ended Outputs...

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EE 214 Lecture 22 (HO#30) B. Murmann 1 Lecture 22 OTAs with Single Ended Outputs Output Stage Examples Boris Murmann Stanford University [email protected] Copyright © 2004 by Boris Murmann EE 214 Lecture 22 (HO#30) B. Murmann 2 Overview Reading – 4.3.5 (Differential Pair with Current Mirror Load) – 6.3.3 (Systematic Offset in Two-Stage Amplifier) – Chapter 5 (Output Stages) Introduction – This lecture concludes our discussion of amplifier implementations by looking at a number of missing bits and pieces. First, we will discuss subtleties of OTA implementations that use a single ended output. While rarely used in the signal path of high performance integrated circuits, OTAs with single ended outputs can be useful as auxiliary amplifiers in biasing circuits. Finally, we will take brief look at output stages that are suitable for driving resistive loads. While most on-chip loads tend to be capacitive in nature, low impedance drivers are often needed when interfacing to off-chip components and wire lines.
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EE 214 Lecture 22 (HO#30) B. Murmann 3 Single Ended OTA Current mirror performs "differential to single-ended conversion" V DD v id /2 V o -v id /2 i od /2 i od /2 i od /2 i od EE 214 Lecture 22 (HO#30) B. Murmann 4 Mirror Doublet Half of the output current comes directly from the differential
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This note was uploaded on 04/17/2008 for the course EE 214 taught by Professor Murmann,b during the Fall '04 term at Stanford.

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h30_lecture22_2 - Lecture 22 OTAs with Single Ended Outputs...

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