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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> ultra-low bandwidth filtering and signal detection https://designers-guide.org/forum/YaBB.pl?num=1098126338 Message started by vakilia on Oct 18th, 2004, 12:05pm |
Title: ultra-low bandwidth filtering and signal detection Post by vakilia on Oct 18th, 2004, 12:05pm Hi, I am now workign on a mixed-mode sensor interface IC that requiers a very-low bandwidth filtering (0-0.01Hz). The sensor is capacitive with a -3dB frequency of 100Hz, so it needs on-chip noise band limitation anyway. I myself am thinking of using high-order SC filters but there are two main problems: Large total capacitance and signal fading through the leakage of CMOS switches. BTW I want to use sigma-delta modulator as well to generate digital output. Do you have any suggestion how and where I could do the filtering in my circuit? Thank you, Babak |
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