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:
Jun. 16, 1998
Filed:
Mar. 14, 1996
Jaime E Kardontchik, Sunnyvale, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A mixer contains a multiplier circuit that includes MOS transistors configured as a Gilbert multiplier cell without gain resistors such that a first and a second node are directly coupled to a folded cascode output stage. The mixer receives a differential radio frequency (RF) signal and a differential local oscillator (LO) signal, and it generates, at the first and second nodes, a differential intermediate frequency (IF) signal. The mixer further includes output and gain/filter stages coupled to the multiplier circuit. The output stage exhibits a low input impedance and a high output impedance, and it generates an output stage differential current approximately equal to the differential current of the IF differential signal. The gain/filter stage both controls conversion gain of the mixer, and it filters the high frequency components generated by said multiplier circuit. A capacitor, implemented as the gain/filter stage, and a folded-cascode circuit for the output stage are disclosed.