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. 26, 1995
Filed:
Jul. 18, 1994
Pineabrim McCullough, Jr, Tempe, AZ (US);
Hugh R Malone, Phoenix, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A digital adjustable phase modulator and method includes a first circuit path and a second circuit path for a signal. A fixed bias voltage is coupled to the first circuit path and to the second circuit path which respectively include first and second active variable reactance components such as varactor diodes. The first circuit path and the second circuit path further include chip capacitors to provide a DC block for first and second MMIC single pole double throw switches, and transmission lines for the signal have a length of one-fourth of a wavelength of the signal to provide an RF short. A control voltage is coupled to the first and second varactor diodes such that the capacitances across the first and second varactor diodes changes, resulting in a phase difference between the signal traversing the first circuit path relative to the signal traversing the second circuit path.