Automatic radio frequency feedback calibration circuit

Details Automatic radio frequency feedback calibration circuit Automatic radio frequency feedback calibration circuit

2007-07-05

2009-02-24

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S018000, C331S044000, C327S158000

Reexamination Certificate

active

07495518

ABSTRACT:
A calibration circuit is configured to provide automatic feedback calibration during a tuning cycle. Automating the calibration process reduces the engineering evaluation time and mass production test time. The calibration settings vary as a function of frequency, and the calibration circuit automatically determines the proper calibration for any frequency application. The calibration circuit enhances communication performance by comparing and computing a time difference between a reference path and a feedback path. The calibration circuit is configured as part of a phase modulation path within a modulation circuit. The calibration circuit provides for calibration without prior knowledge of the system and reduced factory test time. The calibration circuit provides numerous advantages, including, but not limited to, accurate system results for time, frequency, temperature, and process variations with each calibration, or tuning.

REFERENCES:
patent: 6873213 (2005-03-01), Tsuda et al.
patent: 7274231 (2007-09-01), Gillespie et al.

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