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:
Oct. 09, 2007
Filed:
Dec. 17, 2003
James A. Bailey, Snowflake, AZ (US);
Stephen J. Franck, Felton, CA (US);
James A. Bailey, Snowflake, AZ (US);
Stephen J. Franck, Felton, CA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
An AC coupling network has (a) a first pair of capacitances Cconnected between the input nodes and the output nodes and (b) a second pair of capacitances Ccross-connected between the input nodes and the output nodes. The capacitances Cand Care formed by sets of switched capacitors that can be configured to provide the network with different levels of attenuation while maintaining a constant AC coupling pole frequency. In particular, the sets of switched capacitors can be configured to ensure that C+Cremains constant, while C−Cvaries. The present invention enables AC coupling to be implemented without using active devices such as operational amplifiers and/or buffers.