Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-06-21
2005-06-21
Burd, Kevin (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
06909754
ABSTRACT:
A quadrature device1for a communication device, receiver, transmitter, transceiver, telephone, mixer, modulator or demodulator comprises I and Q signal paths and corresponding signal paths components2I,2Q;4I,4Q;9I,9Q showing a mismatch. The device1comprises switching circuitry3, 3′, 6, 3″, 3′″ for data dependently exchanging the I and Q signals in the I and Q paths in order to improve adverse effects, such as reduction of leakage of quantisation noise from the image band to the signal band in a quadrature modulator. Even mismatch effects between digital to analog converters (DAC's) in a feedback path of a sigma delta (ΣΔ) modulator are compensated.
REFERENCES:
patent: 4048574 (1977-09-01), Barbier et al.
patent: 5978823 (1999-11-01), Koslov et al.
patent: 6157235 (2000-12-01), Bautista et al.
J. Crols et al., “Low-IF Topologies for High-Performance Analog Front Ends of Fully Integrated Receivers”, IEEE Transactions on Circuits ans Systems-II: Analog and Digital Processing; vol. 45, No. 3, Mar. 1998, pp. 269-282.
Donald A. Kerth et al, “An Oversampling Converter for Strain Gauge Transducers”, vol. 27, No. 12, Dec. 1992, pp. 1689-1696. (Abstract).
Breems Lucien Johannes
Dijkmans Eise Carel
Kunnen Henricus J.
Burd Kevin
Koninklijke Philips Electronics , N.V.
Waxler Aaron
LandOfFree
Method and quadrature device for compensating mismatch in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and quadrature device for compensating mismatch in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and quadrature device for compensating mismatch in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3466679