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:
May. 15, 1990
Filed:
May. 01, 1989
Barry W Herold, Boca Raton, FL (US);
Omid Tahernia, Coconut Creek, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method of and apparatus for automatically selecting one of first and second loop bandwidth states of a phase lock loop circuit of a frequency synthesizer. The phase lock loop circuit is governed by a reference frequency signal and a feedback frequency signal to adjust the frequency of the synthesized frequency signal to a frequency channel setting. Each of the reference and feedback frequency signals include one phase indication per frequency period. The feedback frequency signal is phase and frequency representative of the synthesized frequency signal. The loop bandwidth of the phase lock loop circuit is automatically switched from the first to the second state based on an initial occurrence of three successive phase indications of a selected one of the reference and feedback frequency signals between successive phase indications of the other, and automatically switched back from the second to the first state based on an initial occurrence of two successive phase indications of the other frequency signal between successive phase indications of the selected frequency signal.