Quadrature gain and phase imbalance correction in a receiver

Details Quadrature gain and phase imbalance correction in a receiver Quadrature gain and phase imbalance correction in a receiver

Filed on

2006-04-25

Date issued

2006-04-25

Examiner

Pascal, Robert (Department: 2817)

Patent Class

Pulse or digital communications

SubClass

Systems using alternating or pulsating current

SubSubClass

Plural channels for transmission of a single pulse train

Type

Reexamination Certificate

Status

active

Patent number

07035341

Description

ABSTRACT:
The present invention utilizes circuitry, already present in receivers, to calibrate and correct for gain and phase errors in a transceiver device. The present invention employs a digital signal processor along with multiple phase shifters and all pass networks to ensure proper levels of quadrature signals within the transceiver. An internally generated double sideband suppressed carrier signal is created to produce the calibration signals used by the digital signal processor.

REFERENCES:
patent: 3937882 (1976-02-01), Bingham
patent: 4122448 (1978-10-01), Martin
patent: 5396656 (1995-03-01), Jasper et al.
patent: 5949821 (1999-09-01), Emami et al.
patent: 6009317 (1999-12-01), Wynn
patent: 6330290 (2001-12-01), Glas
patent: 6618096 (2003-09-01), Stapleton
patent: 6744829 (2004-06-01), Mohindra
patent: 6940916 (2005-09-01), Warner et al.
patent: 2003/0165203 (2003-09-01), Mohindra

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