T09 OTA_sss.pdf - bSpace
T09 OTA_sss.pdf - bSpace
T09 OTA_sss.pdf - bSpace
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Fully differential noise<br />
vi<br />
- +<br />
+ -<br />
Vop<br />
Von<br />
CLeff<br />
CLeff<br />
on<br />
C<br />
C s<br />
f C f C L,eff ¯V<br />
F<br />
C 2 C<br />
f<br />
= KT<br />
f<br />
C f<br />
F =<br />
¯V<br />
C f + C s + C i<br />
on 2 =( C s<br />
) 2 2 ¯V<br />
C<br />
Cs<br />
+ KT + KT 1<br />
f<br />
¯v out 2 =¯v on 2 C f<br />
+¯v op 2 C L,eff<br />
=2 KT F n n F 2<br />
F<br />
F =<br />
FC C f Leff<br />
C f + C s + C i<br />
¯v out 2 =¯v on 2 +¯v op 2 =2 KT n F<br />
2X Noise Power!<br />
FC Leff<br />
V on,0−pk = V dd − V lim,up − V lim,dwn<br />
2<br />
V out,0−pk = V dd − V lim,up − V lim,dwn<br />
SNRdiff=SNR,se+3dB<br />
Cost:2x cap, area<br />
4X Signal Power!<br />
EECS 240 Topic 9: <strong>OTA</strong><br />
© 2007 B. Boser & A. Niknejad
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