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:
Aug. 15, 2000
Filed:
Mar. 29, 1999
Jeffery C Durec, Chandler, AZ (US);
David K Lovelace, Chandler, AZ (US);
Dennis L Welty, Mesa, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An RF mixer (10) provides signal gain in a transconductor block (12). A first transistor (36) is sized M times larger than a second transistor (18) to generate the desired signal gain. The gain of the RF mixer (10) is the value M times an output impedance Z.sub.OUT divided by an input impedance Z.sub.IN. A first current (I.sub.40) conducted by the first transistor (36) is matched to a sum of the second current (I.sub.24) conducted by the second transistor (18) and a third current (I.sub.28). The first current is supplied to a first differential transistor pair (46, 48) and the summed current is supplied to a second differential transistor pair (56, 58) to provide balance in switching circuit (50).