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. 10, 1989
Filed:
Oct. 19, 1987
Jeffrey K Wilkins, Stanford, CA (US);
Other;
Abstract
A closed loop variable phase shift circuit utilizing a variable time delay line controlled by feedback provided by a phase detector. The circuit employs feedback control to adjust the delay of the time delay line to achieve the desired phase shift. By utilizing a variable time delay element of large dynamic range, the circuit can achieve the desired phase shift over a wide frequency range. The circuit provides an extremely accurate phase shift without need for a multitude of high precision matched components. The circuit is easily realizable in integrated circuit form. The circuit can be implemented to phase shift either analog or digital input signals. The amount of phase shift is set by an externally applied voltage.