Method and apparatus for generating a quadrature clock

Details Method and apparatus for generating a quadrature clock Method and apparatus for generating a quadrature clock

2005-07-12

2005-07-12

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

C327S254000

Reexamination Certificate

active

06917232

ABSTRACT:
A quadrature dock generating apparatus includes a clock generator providing a double clock having a frequency that is twice that of a received reference clock. Divider circuitry is coupled to provide an alignment signal having half the frequency of the double clock. A recovery circuit recovers a first clock and a second clock from the double clock in accordance with the alignment signal. The first and second clocks have substantially a 90° phase difference.

REFERENCES:
patent: 6282413 (2001-08-01), Baltus
patent: 6337976 (2002-01-01), Kudou
patent: 6466086 (2002-10-01), Syoji
patent: 6545546 (2003-04-01), Takeshita et al.

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