Patent · US Expired

Fully integrated self-tuned image rejection downconversion system

US6892060B2 · kind B2 · utility

42Cited by
13References
26Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJun 28, 2002
Grant dateMay 10, 2005
Priority date—
Expiry dateSep 7, 2023

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04B1/28
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

A feedback image rejection downconversion system is described, which can be used in low IF receivers with good performance and completely integrated. In the forward path of the system, quadrature mixers and complex filters are used for frequency downconversion and separation of the RF signal from the image signal. In the feedback path, a correlator, a gain mismatch estimator and two VGAs have been used to detect, estimate and compensate the amplitude and phase mismatch between the forward I and Q path signals. The whole system is self-tuned and can operate in both closed and open loop mode. A very high and robust image rejection ratio (over 60 dB) has been achieved.

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