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:
Jun. 27, 1995
Filed:
Aug. 29, 1994
Craig E Lindberg, Chandler, AZ (US);
Michael Dydyk, Scottsdale, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A biphase modulator without matching elements includes a Lange coupler (5) including first, second, third, and fourth ports (1,2, 3, 4), where the first port (1) receives a RF input signal. FETs (6, 7) each have a source, gate, and drain (19, 17, 18 and 22, 20, 21). The drain (18) of the first FET (6) is coupled to the second port (2), the source (19) of the first FET (6) and the second FET (7) are coupled to electrical ground, and the drain (21) of the second FET (7) is coupled to the fourth port (4). The FETs, are switched at the desired modulation frequency by a control input (16) to the gates (17, 20), alternately providing a zero volt signal and a pinch-off voltage signal which produces a biphase modulated RF input signal at the third port (3) of the Lange coupler (5).