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:
Jul. 22, 2008
Filed:
Oct. 04, 2005
Stephen J. Rector, Tempe, AZ (US);
Stephen J. Rector, Tempe, AZ (US);
Freescale Semicondutor, Inc., Austin, TX (US);
Abstract
Method and apparatus are provided for linearized balanced signal mixing. A signal mixing circuit () for translating a radio frequency (RF) signal is provided comprising an input amplifier (), a mixer network (), and an output buffer amplifier (). The input amplifier () is configured to produce an amplified RF signal and cancel an input third-order intermodulation (IM) distortion in the amplified RF signal with a cross-coupled feedback amplifier (). The mixer network () is configured to produce an intermediate frequency (IF) signal based on the amplified RF signal and a local oscillator signal. The output amplifier () is configured to buffer the IF signal and cancel an output IMdistortion in the IF signal with a cross-coupled feedback amplifier (). The input amplifier () and cross-coupled feedback amplifier () also serve as a bias current source for the mixer network (), thus lowering the supply voltage required for the mixing circuit ().