Switched capacitors filters

[vkoro]

Does anyone have experience in application of the switched capacitors filters for signals with micro Volts amplitude and frequency 5 to 100 Hz. I would be happy to hear any ideas and opinions.
Thank you

 

[jbartos]

Suggestion: Try References
1. Lacanette, Kerry, "A basic introduction to filters--active, passive, and switched-capacitor," Application Note 779, National Semiconductor Corp.
2. Ghausi, MS, and KR Laker, Modern Filter Design: Active RC and Switched-Capacitors, Prentice Hall, 1981.
3. Lancaster, Don, Active Filter Cookbook, Synergistics Press, 1995.
4. Galter, Robert, and Victor Mayper, "Reducing noise in a switched-capacitor low-pass filter," Sensors, December 1996.

 

[vkoro]

Thanks jbartos
I have looked through the articles except last one. Really good information in Linear Tech An.40. I am working with signals less than10uV and a filter noise is the problem. Now I need LP filter (at least 8- order) with adjustable cut-off frequency and Switched C filter perfectly fits. I have tried LTC1062 and LTC1064, both produce more noise than active RC filter ( 8-order, multiple feedback, LT1002). Although the noise level should be the same ( Specifications, Linear Tech An. 40, A NOISE AND DISTORTION COMPARISON OF ANALOGUE ACTIVE FILTERS K. A. Mezher1, P. Bowron2 and A. A. Muhieddine3). I do not have equipment for measurement low noise signal and can see the output signal of the next after-filter cascades.
Thank you

 

[nbucska]

The signal fr. is 5 to 100 Hz, what are the requirements
for the filter ?

Can you tell me more ? (application, conditions, etc) <nbucska@pcperipherals.com>