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. 13, 1997
Filed:
Dec. 04, 1995
Raymond L Barrett, Jr, Lauderdale, FL (US);
Barry W Herold, Boca Raton, FL (US);
Grazyna A Pajunen, Delray Beach, FL (US);
Motorola Inc., Schaumburg, IL (US);
Abstract
A frequency synthesizer (100) is used for generating a plurality of signals operating at a plurality of frequencies that are integer multiples of a reference frequency. The frequency synthesizer (100) includes a plurality of phase lock loops coupled to a single phase error detector. The phase error detector (103) is connected to a reference signal (104), a first generated signal (116) and a sampler signal (136) derived from a second generated signal (132). The phase error detector (103) includes a shared counter (118), and first and second registers (106, 122) connected to the output of the shared counter (118). First and second phase lock loops (101, 105) are used for phase locking to the reference signal (104). The first and second phase lock loops (101, 105) derive phase error signals from the first and second registers (106, 122), thereby adjusting the first and second generated signals (116, 132).