L11 lecture

L11 lecture - – How do we get V oc • Resistive divider...

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EECS 240 Lecture 11: Common-mode Feedback B. Boser 1 Common-Mode Feedback Problem – High gain (~ A dm ) from tail current source to V oc amplifies mismatch –V oc rails at either supply Solution – Feedback to regulate V oc to desired value V cmfb0 (usually ~ mid-supply) – Control point: tail or load current source(s)
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Unformatted text preview: – How do we get V oc ? • Resistive divider • Amplifier • Capacitive divider EECS 240 Lecture 11: Common-mode Feedback B. Boser 2 Dynamic CMFB • Stability of CMFB loop • Loop gain • Settling accuracy, speed • Simulation – Transient – AC...
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This note was uploaded on 08/01/2008 for the course EECS 240 taught by Professor Boser during the Spring '04 term at Berkeley.

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