T09 OTA_sss.pdf - bSpace
T09 OTA_sss.pdf - bSpace
T09 OTA_sss.pdf - bSpace
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Resistive Feedback<br />
OpAmp<br />
• Gain independent of<br />
feedback network<br />
• Feedback network<br />
adds noise<br />
EECS 240 Topic 9: <strong>OTA</strong><br />
<strong>OTA</strong><br />
• Resistive feedback<br />
network lowers loop gain<br />
• Large feedback resistors?<br />
– Large area<br />
– Parasitic poles stability?<br />
• Solution: capacitive<br />
feedback<br />
– Needs initialization<br />
– Needs clock <br />
Linear, time-variant circuit<br />
• kT/C noise<br />
© 2007 B. Boser & A. Niknejad
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