The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1993
Filed:
Feb. 12, 1990
Yasumi Imagawa, Kanazawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
The center frequency of each of the analog filters with different selectivities each other installed in an automatic adjusting circuit is automatically adjusted in accordance with a bias input signal which is generated by the phases detectors respectively associated with the analog filters in accordance with a frequency difference, so as to be equal to the reference frequency of an input signal applied to the two analog filters. The bias input signal is fed to an analog filter to be controlled, which is formed on the same chip as that of the above two filters. A coarse adjustment is based on the output signal of the phase detector associated with the analog filter with a low selectivity. A fine adjustment is based on the output signal of the phase detector associated with the analog filter with a high selectivity. An accuracy of matching the center frequency to the reference frequency is determined by both the selectivity of the analog filter with a high selectivity and the ratio of the output signals of the two phase detectors in the automatic adjusting circuit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile