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:
Nov. 09, 1999
Filed:
Oct. 31, 1997
Mark Francis Hilbert, Naperville, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A variable phase shift network (420) for a phase quadrature signal generator (320, 370) includes a variable current controller (909), a first NPN transistor (801) and a second NPN transistor (802). The variable phase shift network (420) produces a first quadrature input signal (830), a second quadrature input signal (834), a first quadrature output signal (821) and a second quadrature output signal (826) responsive to receiving a first differential input signal (919) and a second differential input signal (925). The variable current controller (909) controls current in a first NPN transistor (801) to vary an emitter resistance (846) in the first NPN transistor (801) and controls current in a second NPN transistor (802) to vary an emitter resistance (847) in the second NPN transistor (802) to adjust a phase quadrature relationship between the first quadrature output signal (821) and the first quadrature input signal (830) and to adjust a phase quadrature relationship between the second quadrature output signal (826) and the second quadrature input signal (834).