Thomas P Rodriguez

US Patent:

7420426, Sep 2, 2008

Filed:

Dec 30, 2005

Appl. No.:

11/323294

Inventors:

Scott W. Herrin - Round Rock TX, US
Chris C. Dao - Pflugerville TX, US
Patrick M. Falvey - Austin TX, US
Thomas J. Rodriguez - Austin TX, US

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

H03L 7/085

US Classification:

331 1A, 331 17, 327156, 327159, 375376

Abstract:

A frequency modulated output of a digital locked loop (DLL) is implemented with a Johnson Counter outputting a sample clock and a synchronized digital code at a multiple of the sample clock. The digital code drives a digital-to-analog converter to generate a frequency modulated control signal. The control signal is summed with the center frequency control from the digital locked loop digital filter to provide a frequency modulated center frequency control signal to the DLL oscillator.

US Patent:

7482880, Jan 27, 2009

Filed:

Nov 8, 2006

Appl. No.:

11/557721

Inventors:

Scott W. Herrin - Austin TX, US
Chris C. Dao - Pflugerville TX, US
Patrick M. Falvey - Austin TX, US
Thomas J. Rodriguez - Austin TX, US

Assignee:

Freescale Semiconductor, Inc. - Austin TX

International Classification:

H03L 7/087

US Classification:

331 1A, 331 11, 327159, 375376

Abstract:

A frequency modulated output of a Digital Locked Loop (DLL) is implemented with a Johnson Counter outputting a sample clock and a synchronized digital code at a multiple of the sample clock. The digital code drives a digital-to-analog converter to generate a frequency modulated control signal. The control signal is summed with the center frequency control from the digital locked loop digital filter to provide a frequency modulated center frequency control signal to the DLL oscillator.