Open-loop correction of duty-cycle error and quadrature phase error

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United States of America Patent

PATENT NO 9444442
APP PUB NO 20140253195A1
SERIAL NO

14165370

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Abstract

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A Phase Interpolator (PI) may be employed as a precisely-controlled delay element in a transmit path, for example in clock forwarded serial links. Methods and circuits are disclosed for estimating a delay needed to correct duty-cycle/and or phase errors of the received clock. These corrections or delta values may be transmitted back to the transmitter side, preferably expressed directly in terms of PI phase codes, for convenient adjustment in the transmitter clock circuitry. Various techniques also are disclosed for measuring and mitigating the effects on PI integral non-linearity.

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Patent Owner(s)

  • RAMBUS INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chandrasekaran, Srinivasaraman Bangalore, IN 7 78
Srinivas, Gundlapalli Shanmukha Bangalore, IN 2 42

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