Apparatus and method for adjusting quadrature modulator,...

Details Apparatus and method for adjusting quadrature modulator,... Apparatus and method for adjusting quadrature modulator,...

2005-01-28

2009-12-29

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S301000

Reexamination Certificate

active

07639756

ABSTRACT:
Disclosed are an apparatus and a method for the adjustment time for IQ offset of a quadrature modulator of a transmission circuit. In adjusting the I-offset and the Q-offset of a quadrature modulator, supplied with an I-signal and a Q-signal output from an analog baseband unit to modulate a carrier. Set-up values of the I-offset and the Q-offset, associated with at least three different points on an IQ offset correction plane having an I-component and a Q-component as X- and Y-coordinates, are set for the analog baseband unit at respective different set-up timings. The values of the carrier leak level, associated with three-point offset set-up values of the output signal of the quadrature modulator, are acquired by a sole measurement operation. From the measured values of the three-point carrier leak levels, the values of the carrier suppression ratio for the three points are found from the measured values of the three points of the carrier leak level to find the optimum set-up values of the I-offset and the Q-offset.

REFERENCES:
patent: 5119399 (1992-06-01), Santos et al.
patent: 6570933 (2003-05-01), Makinen
patent: 7068983 (2006-06-01), Kanazawa et al.
patent: 2002/0191713 (2002-12-01), McVey
patent: 2003/0231075 (2003-12-01), Heiskala et al.
patent: 2004/0132424 (2004-07-01), Aytur et al.
patent: 2004/0146118 (2004-07-01), Talwalkar et al.
patent: 2004/0230393 (2004-11-01), Andersson
patent: 2004/0252782 (2004-12-01), Demir et al.
patent: 2000-124964 (2000-04-01), None

Affiliated with

Also associated with

Rating

Apparatus and method for adjusting quadrature modulator,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for adjusting quadrature modulator,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for adjusting quadrature modulator,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4065857