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:
Jun. 06, 1995
Filed:
Sep. 17, 1993
Raymond L Barrett, Jr, Ft. Lauderdale, FL (US);
Barry W Herold, Boca Raton, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A selective call receiver (100) includes a phase lock loop frequency synthesizer having a programmable output frequency signal (414) responsive to a control current signal (417). The phase lock loop frequency synthesizer includes a programmable gain current multiplier (412), a gain of which is determined by a control word selected such that a loop gain of the synthesizer remains relatively constant over a predetermined operating domain of a programmable output frequency signal (417). The current multiplier generates (412) the control current signal (417) by subtracting a reference current (415) from a limited current (416), thus bounding a range of the control current signal (417) within a maximum value of substantially the reference current (415) and a minimum value of the difference between the reference current (415) and the limited current (416).