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. 03, 1992
Filed:
Dec. 03, 1990
Russell E Braathen, Calgary, CA;
NovAtel Communications, Ltd., Calgary, CA;
Abstract
An active filtering mixer has a feedback arrangement, by means of which unwanted components in the output of the mixer are fed back, out of phase, to an input of the mixer for substantially canceling such components dynamically within the mixer, itself. In so doing, active filtering mixers in accordance with the invention largely avoid the undesirable effects these components can have on signal processing in downstream devices, and within the mixer. The feedback arrangement also stabilizes the mixer's DC operating point, and thereby can maintain the maximum dynamic range of the mixer. Preferably, the desired components of the output are also fed back, but to a substantially smaller degree than the unwanted components, thereby linearizing the in-band output of the mixer, and generallly improving the mixer's performance over the entire spectrum of its output.