Lecture 16-Differential Mode Voltage Range & Two Stage OTA

Lecture 16-Differential Mode Voltage Range & Two Stage OTA

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
EE 214 Lecture 16 (HO#22) B. Murmann 1 Lecture 16 Differential Mode Voltage Range Two-Stage OTA Boris Murmann Stanford University murmann@stanford.edu Copyright © 2004 by Boris Murmann
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
EE 214 Lecture 16 (HO#22) B. Murmann 2 Overview Reading – 6.3 (Basic Two-Stage MOS Amplifiers) – 12.6.1 (Fully Differential Two-Stage-Amplifier) Introduction – As we will see in today's lecture, the available output swing and open-loop gain of our simple single stage OTA are fairly limited. Hence, we will begin to consider a two-stage OTA architecture as an alternative. Unfortunately, with the addition of a second stage, we also introduce a second pole, which makes it difficult to achieve reasonable phase margin. The compensation techniques discussed in the following lecture will provide solutions to this problem.
Background image of page 2
EE 214 Lecture 16 (HO#22) B. Murmann 3 Output Swing of Simple OTA Available output swing depends on input and output common mode levels May be limited by headroom for differential pair device (V minn ) or active load (V minp ) V DD V oc V ic V ic -V t OV V minp V minn
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
EE 214 Lecture 16 (HO#22) B. Murmann 4 Maximum Available Swing Input and output common mode adjusted such that all devices operate at "edge" of forward active region – Well defined using long channel model, very gradual transition in short channels
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

Lecture 16-Differential Mode Voltage Range & Two Stage OTA

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online