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:
Jan. 01, 2002
Filed:
Nov. 29, 2000
Nader Fayyaz, Ottawa, CA;
SiGe Microsystems Inc., Ottawa, CA;
Abstract
A mixer is designed to operate from a low voltage power source connected via a power terminal and ground and includes a balanced mixer circuit with a balanced input port for receiving local oscillator signals, and a pair of input terminals. A biasing circuit includes, an active voltage divider connected between the power terminal and ground to provide higher and lower voltages at first and second voltage taps. A differential driver circuit includes first and second transistors, collectors of which are each direct coupled to separate ones of the pair of input terminals. The first transistor has a base coupled via a capacitor to a single ended receive signal terminal, and an emitter coupled via a first resistor to ground. The second transistor has a base coupled via a capacitor to grounds, and an emitter coupled via a second resistor to the single ended receive signal terminal. The single ended receive signal terminal is also coupled with ground via an impedance element, in one example third resistor. A fourth resistor is connected between the first voltage tap and the base of the second transistor and, a fifth resistor is connected between the second voltage tap and the base electrode of the first transistor.