Rambus patent, four years later

- after filing the application - this patent issued . . .

United States Patent 6,937,073

Dally, et al. August 30, 2005

Frequency multiplier with phase comparator

Abstract
A phase comparison of timing signals is made by combinational circuitry which receives the timing signals and a window signal, the window signal identifying edges of the timing signals to be compared. The comparison may result in a charge pumped output which can be fed back to control the phase of one of the timing signals. The phase comparator and charge pump circuit can be included in a multiplier circuitry in which the phase of an input signal is directly compared to the phase of an edge of the multiplied signal.

Inventors: Dally; William J. (Stanford, CA); Farjad-Rad; Ramin (Mountain View, CA); Stone; Teva J. (San Jose, CA); Yu; Xiaoying (Milpitas, CA); Poulton; John W. (Chapel Hill, NC)

Assignee: Rambus Inc. (Los Altos, CA)

Appl. No.: 849920

Filed: May 4, 2001