Patent Number: 7,714,667

Title: Programmable linear trimming method and system for phase locked loop circuit calibration

Abstract: The present invention implements an apparatus for calibrating a phase locked loop (PLL) circuit. The apparatus includes a detector for detecting frequencies of a reference signal and a controlled oscillator contained in the PLL circuit. The detector outputs the frequency difference to a control circuit. The control circuit is programmed to adjust one or more control signals to the controlled oscillator based upon the frequency difference in an orderly fashion to complete the calibration process.

Inventors: Dai; Xingdong (Bethlehem, PA), Ahmed; Yasser (Macungie, PA), Abel; Christopher J. (Coplay, PA), Logan; Shawn Michael (Andover, MA)

Assignee: Agere Systems Inc.

International Classification: H03L 7/113 (20060101)

Expiration Date: 5/11/12018