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:
Jun. 01, 2010
Filed:
Mar. 31, 2008
Joseph Jengtao Tzou, Mountain View, CA (US);
Suresh Parameswaran, Fremont, CA (US);
Thinh Dinh Tran, Palo Alto, CA (US);
Joseph Jengtao Tzou, Mountain View, CA (US);
Suresh Parameswaran, Fremont, CA (US);
Thinh Dinh Tran, Palo Alto, CA (US);
Abstract
An improved circuit and method for programmable cascading of impedance matching in a multi-chip configuration are disclosed. Handshaking is implemented in cascaded chips by defining a master-slave configuration, and impedance is evaluated in cascaded chips in a non-overlapping manner. The circuit includes a plurality of chips arranged in a cascading configuration. A cascade output pin of a chip is coupled to a cascade input pin of a cascaded chip to enable handshaking between the plurality of chips. The plurality of chips are coupled to a common precision resistor via a common impedance line to enable each chip to calibrate impedance of the chip. Each of the plurality of chips includes a control circuit. Each control circuit includes a state machine circuit. The control circuit is configured to control a non-overlapping clock cycle of each chip during which the impedance of the chip is evaluated.