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. 07, 2002
Filed:
Mar. 04, 1998
Hoai Xuan Vu, Stanton, CA (US);
Toan Xuan Vu, Stanton, CA (US);
Symbol Technologies, Inc., Holtsville, NY (US);
Abstract
A differential ring oscillator is provided with three differential amplifiers and provides three-phase output signals which can be used for synchronous detection of a received multi-phase modulated signal in a multi-phase receiver, wherein the phase of the local oscillator signals may be in other-than-quadrature relation. Two of the phase outputs of the local oscillator can be combined to provide a signal that is in quadrature with the remaining output. The oscillator is preferably controlled in coarse frequency control steps and using a fine voltage control signal responsive to a phase-locked loop to reduce frequency modulation of the oscillator signal arising out of leakage signals.