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US Patent 7508246 Performance variation compensating circuit and method

Patent 7508246 was granted and assigned to Freescale Semiconductor on March, 2009 by the United States Patent and Trademark Office.

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Current Assignee
Freescale Semiconductor
Freescale Semiconductor
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7508246
Date of Patent
March 24, 2009
Patent Application Number
11532295
Date Filed
September 15, 2006
Patent Primary Examiner
‌
Quan Tra
Patent abstract

A circuit's performance may vary based on various factors such as, for example, process, voltage, and/or temperature. In one embodiment, a circuit includes an input terminal which receives an input signal, a delay selection section which delays the input signal by a delay amount selected by a performance variation indicator, an impedance selection section which outputs the delayed input signal as a compensated delayed signal, where the impedance selection section uses a driver impedance amount selected by the performance variation indicator, and an output terminal which outputs the compensated delayed signal. The circuit may also include a ring oscillator, a frequency counter which provides a count value which indicates a number of rising edges of an output of the ring oscillator which occur during a period of a reference frequency, and a decoder which uses the count value to output the performance variation indicator.

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