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. 29, 2002
Filed:
Jun. 23, 1999
Joseph Harold Havens, Tokyo, JP;
Brian K. Horton, Sinking Spring, PA (US);
Agere Systems Guardian Corp., Orlando, FL (US);
Abstract
A four-quadrant mixer is disclosed which has a low noise factor. The indeterminate common-mode voltage that may accompany the modulating signal is suppressed and replaced by a common-mode quiescent voltage designed to establish a predetermined quiescent biasing current through the mixer transistors common biasing resistors so that the mixer may be driven in common-mode by the modulating signal and differentially by the local oscillator signal. Advantageously, a larger value emitter biasing resistor can be used with the same value of emitter current that would obtain in a comparable four-quadrant Gilbert Mixer or, conversely, larger values of emitter current can be specified to establish a desired level of signal to noise ratio.