Patent · US Active

Local oscillator feedthrough cancellation scheme to remove RF and baseband offsets

US7697905B2 · kind B2 · utility

24Cited by

11References

17Claims

0Family size

Assignee

QUALCOMM Incorporated · US

Inventors

C. Paul Lee · San Diego, US
Arya Behzad · Poway, US

Key dates

Filing date	Dec 16, 2005
Grant date	Apr 13, 2010
Priority date	—
Expiry date	Oct 8, 2028

Classification

Technology area (CPC H)Electricity
CPC primaryH04B1/30
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

An scheme to provide local oscillator feedthrough offset cancellation to remove baseband and radio frequency coupled offsets. Two separate offset cancellation currents are injected at a driver which drives a baseband signal into a mixer to mix with a local oscillator signal. One offset cancellation current cancels a baseband local oscillator feedthrough offset, while the other offset cancellation current cancels a radio frequency local oscillator feedthrough offset.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.