Filter automatic adjustment apparatus, filter automatic...

Details Filter automatic adjustment apparatus, filter automatic... Filter automatic adjustment apparatus, filter automatic...

2006-03-29

2008-08-05

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C333S017100, C327S553000, C327S554000

Reexamination Certificate

active

07408417

ABSTRACT:
The invention provides a filter automatic adjustment apparatus and method, and a mobile telephone system, which realizes low power consumption while adjusting a characteristic frequency of a main filter having an adjustment function to a target frequency. The filter automatic adjustment apparatus includes: a phase difference detector104which outputs a signal having a duty ratio corresponding to a phase difference between an input signal and an output signal of a reference filter103; a comparator105which converts the output signal of the phase difference detector into a rectangular wave; a counter106which consecutively counts a predetermined interval of the rectangular wave plural times; and a determination circuit107which selects a count value satisfying a predetermined criterion from the plural time count values, and the filter automatic adjustment apparatus adjusts the characteristic frequency of the main filter based on the selected count value.

REFERENCES:
patent: 5392456 (1995-02-01), Mitomo et al.
patent: 6646497 (2003-11-01), Tsuda
patent: 6658244 (2003-12-01), Schmal et al.
patent: 7019567 (2006-03-01), Katakura
patent: 2002/0041201 (2002-04-01), Tsuda
patent: 2006/0001482 (2006-01-01), Nakamura et al.
patent: 1 187 326 (2002-03-01), None
patent: 1 580 886 (2005-09-01), None
patent: 2002-76842 (2002-03-01), None
patent: 2004-172911 (2004-06-01), None

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