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.
Patent No.:
Date of Patent:
May. 11, 1982
Filed:
May. 29, 1980
Roubik Gregorian, CA, JP;
Toshiro Suzuki, Tokyo, JP;
American Microsystems, Inc., Santa Clara, CA (US);
Abstract
A switched-capacitor cosine filter for a sampled-data system functions to reject extraneous frequency components of an incoming analog signal around the sampling frequency, thereby avoiding aliasing. The filter comprises an operational amplifier whose inverting input receives input signals through a switched input capacitor controlled by a four-switch network controlled by alternating clock phases and feedback signals from the amplifier output through a feedback capacitor. The transfer function of the circuit provides a zero of transmission at the sampling frequency, thereby eliminating unwanted frequency components. A self-contained version of the cosine filter is provided by the addition of another grounded switched capacitor with appropriately timed switches in the feedback network.