Fully-differential operational

amplifier

Apinunt Thanachayanont

Why differential opamp?

2010Mixed-signal ICs Design, A. Thanachayanont2

2-stage fully-differential opamp

2010Mixed-signal ICs Design, A. Thanachayanont3

2-stage fully-differential opamp with

push-pull output

2010Mixed-signal ICs Design, A. Thanachayanont4

Folded-cascode differential opamp

2010Mixed-signal ICs Design, A. Thanachayanont5

Common-mode output voltage

stabilization

2010Mixed-signal ICs Design, A. Thanachayanont6

Common-mode output voltage

stabilization

2010Mixed-signal ICs Design, A. Thanachayanont7

CMFB concept

2010Mixed-signal ICs Design, A. Thanachayanont8

2-stage opamp with CMFB

2010Mixed-signal ICs Design, A. Thanachayanont9

CMFB circuit using resistive divider

2010Mixed-signal ICs Design, A. Thanachayanont10

CMFB circuit (1)

2010Mixed-signal ICs Design, A. Thanachayanont11

CMFB circuit using resistive divider (2)

2010Mixed-signal ICs Design, A. Thanachayanont12

CMFB circuit using resistive divider (1)

2010Mixed-signal ICs Design, A. Thanachayanont13

CMFB circuit using dual diff. pairs

2010Mixed-signal ICs Design, A. Thanachayanont14

CMFB circuit using triode MOSFETs

2010Mixed-signal ICs Design, A. Thanachayanont15