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:
Oct. 28, 2014
Filed:
Nov. 19, 2012
Kelly F. Garrison, Tigard, OR (US);
Raymond L. Veith, Portland, OR (US);
Gordon A. Olsen, Tigard, OR (US);
Jeffrey D. Earls, Portland, OR (US);
Kelly F. Garrison, Tigard, OR (US);
Raymond L. Veith, Portland, OR (US);
Gordon A. Olsen, Tigard, OR (US);
Jeffrey D. Earls, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
Abstract
An automatic quadrature network with amplitude and phase detection produces quadrature signals for an input oscillator signal, the quadrature signals being equal in amplitude and having ideal quadrature phase between them. An RC circuit provides one quadrature path, and a CR circuit provides another quadrature path. The outputs from the RC/CR circuits are amplitude detected to produce an amplitude control signal. The outputs also are amplitude limited, and the phase between the limiter outputs is detected to produce a phase control signal. The amplitude and phase control signals are combined to generate respective control signals for the RC/CR circuits to automatically align them so that the quadrature signals are of equal amplitude and ideal quadrature phase.