Patent · US Active

System and method for calibrating output frequency in phase locked loop

US8405434B2 · kind B2 · utility

1Cited by

6References

12Claims

0Family size

Assignee

Huawei Technologies Co., Ltd. · CN

Inventors

Anders Jakobsson · Bissenkamp, SE
Christian Grewing · Düsseldorf, DE
Anders Emericks · Sundbyberg, SE
Ola Pettersson · Järfälla, SE
Bingxin Li · Sollentuna, SE

Key dates

Filing date	Aug 19, 2011
Grant date	Mar 26, 2013
Priority date	—
Expiry date	Sep 23, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH03L7/087
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

A Digital Calibration System for a Phase Locked Loop includes a Tuning Voltage Controller configured to set the tuning voltage to a value; a Phase Difference Quantizer configured to output a phase difference after comparing a phase of the reference signal with a phase of the feedback signal; a Digital Controller configured to receive the phase difference of the PDQ and control a coarse tuning signal such that an average phase difference of the PDQ is 0; and a Frequency Calibration Logic configured to calibrate the feedback signal in response to the output of the DC.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.