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. 27, 2001
Filed:
Sep. 03, 1999
Viatcheslav Igor Souetinov, Swindon, GB;
Mitel Semiconductor Limited, Wiltshire, GB;
Abstract
An image reject mixer for a radio receiver comprises transconductors,and,, mixer stages,and,and a phase shift and combiner circuit,The transconductors,and,provide differential output current signals to their respective mixer stage,and,. Capacitors,and,are connected between equivalent outputs of the transconductors,and,respectively. The capacitors,and,have the effect of correlating the output noise of the transconductors,and,and correlating the noise generated by the mixer stage transistors which is leaked to the inputs of the mixer stages,and,, the image frequency components of which noise are thereby cancelled by the operation of the mixer stages,and,and the phase shift and combiner circuit,The capacitors,and,also compensate the second harmonic of the local oscillators which leak through to the inputs of the mixer stages,and,Overall, gain, noise figure and linearity can all be improved without an increase in current consumption.