SC CMFB中两个电容的比值怎么选的?
时间:12-12
整理:3721RD
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如图:
Vo+ -------/ ----------/ ---Vcmref
| |
C1 C2
| |
Vcntrl------/ ----------/ ---Vbias
| |
C1 C2
| |
Vo- -------/ ----------/ ---Vcmref
Jonhns and Martin(p291)书上说:C2应选C1的1/4到1/10之间。
但我看到其他论文中大都选择C2比C1大的值?比如"Analysis of switched-capacitor
common-mode feedback circuit"中选C2/C1=3;
"Two SC-CMFB networks used in fully differential OTA: measurements and impro
vements"中选C2/C1=2;
请问,哪个对?
Vo+ -------/ ----------/ ---Vcmref
| |
C1 C2
| |
Vcntrl------/ ----------/ ---Vbias
| |
C1 C2
| |
Vo- -------/ ----------/ ---Vcmref
Jonhns and Martin(p291)书上说:C2应选C1的1/4到1/10之间。
但我看到其他论文中大都选择C2比C1大的值?比如"Analysis of switched-capacitor
common-mode feedback circuit"中选C2/C1=3;
"Two SC-CMFB networks used in fully differential OTA: measurements and impro
vements"中选C2/C1=2;
请问,哪个对?
看来这个比值要么影响不大,要么还没有定论