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:
Nov. 18, 2003
Filed:
Dec. 02, 2002
Applicant:
Inventors:
Assignee:
Lattice Semiconductor Corporation, Hillsboro, OR (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03B 5/18 ;
U.S. Cl.
CPC ...
H03B 5/18 ;
Abstract
A two-stage coupling loop system that provides in-phase and quadrature signals in the two stages. Each stage includes a signal coupler, an LC-based voltage controlled oscillator (VCO) and an in-loop signal buffer that provides an additional controllable phase shift. Inclusion of the buffers in the loop decreases the capacitance load of each VCO.