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:
Sep. 03, 1991
Filed:
Oct. 27, 1989
Applicant:
Inventor:
Alfred N Riddle, Milpitas, CA (US);
Assignee:
Avantek, Inc., Milpitas, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L / ; H03K / ; H01P / ;
U.S. Cl.
CPC ...
307511 ; 307513 ; 328 55 ; 333164 ;
Abstract
A 180 degree ultraminiature phase shifter. Only two switching devices and very few passive circuit elements are required, thus allowing an extremely small and low loss device to be fabricated. When power is applied to switching devices, a low pass pi section low pass filter is realized which provides +90 degrees of phase shift. When power is absent from the switching devices, a T section high pass filter is realized which provides -90 degrees of phase shift.