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:
Apr. 26, 2011
Filed:
Feb. 09, 2009
Benjamin Esposito, Pittsboro, NC (US);
Benjamin Esposito, Pittsboro, NC (US);
Altera Corporation, San Jose, CA (US);
Abstract
Techniques and an apparatus for producing pulse width modulation (PWM) edges are described. A PWM controller circuit with a polyphase counter is described. The polyphase counter may comprise a plurality of counters. Each of the counters may be set to a specific initial count value. A polyphase decoder block with a plurality of sets of high/low decoders are coupled to outputs from the polyphase counter. A set/reset block with a plurality of set/reset logic elements is coupled to outputs from the polyphase decoder block. A serializer is coupled to outputs from the plurality of set/reset blocks to generate PWM edges. Multiple parallel phases of a PWM pulse may be created with the circuit. Using a polyphase counter and comparator to create multiple parallel phases may speed up the controller circuit and provide a finer tuning resolution.