The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Date of Patent:
Aug. 09, 1988

Filed:

Apr. 30, 1986
Applicant:
Inventor:

Mehrdad Negahban-Hagh, Irvine, CA (US);

Assignee:

Silicon Systems, Inc., Tustin, CA (US);

Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H / ; G11C / ;
U.S. Cl.
CPC ...
333173 ; 307353 ; 307523 ; 328151 ; 330-9 ; 330109 ;
Abstract

A filter for second order signals in the frequency domain. A novel switching system is described which permits a single capacitor to serve as both a termination capacitor and a sampling capacitor. A capacitor which has a value equal to the desired value of a sampling capacitor is coupled in a feedback loop of an operational amplifier. This capacitor is summed with another capacitor to result in the desired value of the termination capacitor. The present invention permits the fabrication of second order filters in a smaller silicon area than prior art methods.


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Negahban-Hagh, Mehrdad. (1988). Switching scheme for switched capacitor filters (U.S. Patent No. 4763088). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4763088

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