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:
Sep. 16, 2008
Filed:
Jun. 30, 2006
Christopher J. Abel, Coplay, PA (US);
Joseph Anidjar, Asbury, NJ (US);
Vladimir Sindalovsky, Perkasie, PA (US);
Craig B. Ziemer, Fleetwood, PA (US);
Christopher J. Abel, Coplay, PA (US);
Joseph Anidjar, Asbury, NJ (US);
Vladimir Sindalovsky, Perkasie, PA (US);
Craig B. Ziemer, Fleetwood, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A phase interpolator generates a phase-interpolated output clock signal Z from two phase-offset input clock signals A and B, where the interpolation angle of the output clock is based on a weight value W. The phase interpolator has A-side and B-side circuitry, each having (1) an array of parallel current mirrors, (2) a block of parallel switches, where each switch is connected in series with a corresponding current mirror, and (3) an encoder that controls the corresponding switches based on the weight value W. The total current through the phase interpolator varies with interpolation angle, such that, for example, the variation in output amplitude with interpolation angle is reduced. In general, individual bit values in weight value W are not used to control individual switches for all interpolation angles.