Title: LC Simulated filter with transmission zeros

Abstract: An active filter employing a plurality of integrators which may be fabricated as a metal-oxide-semiconductor (MOS) integrated circuit is described. S-plane zeros are obtained without additional active devices when compared to prior art filters without such zeros. The zeros result from resistive coupling between the integrators. Resistance ratios and capacitance ratios primarily determine the filter's characteristics rather than the absolute value of these elements. This permits the filter to be readily fabricated with existing MOS technology.

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Inventors: Gray, Paul R. (Orinda, CA, US)

Application Number: 868976
Filing Date: 1978-01-12
Publication_date: 1979-09-18
Assignee: Intel Corporation (Santa Clara, CA)
Primary Class(es): 327/552 333/214
Other Classes:
US Patent Ref:

3513401	May, 1970	Tokunaga	328/167.
3716729	Feb, 1973	Rollett	307/295.
3749942	Jul, 1973	Moses	307/233.
3831103	Aug, 1974	Ruegg et al.	328/167.
3835399	Sep, 1974	Holmes	328/167.
3886469	May, 1975	Rollett et al.	330/107.

Other Refs:
Primary Examiner: Heyman, John S.
Assistant Examiner:
Attorney: Blakely, Sokoloff, Taylor & Zafman