Method and quadrature device for compensating mismatch in parallel paths by switching signals therein

A quadrature device 1 for a communication device, receiver, transmitter, transceiver, telephone, mixer, modulator or demodulator comprises I and Q signal paths and corresponding signal paths components 2I, 2Q; 4I, 4Q; 9I, 9Q showing a mismatch. The device 1 comprises switching means 3, 3', 6, 3...

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Bibliographic Details
Main Authors VAN DER ZWAN ERIC JURGEN, BREEMS LUCIEN JOHANNES, DIJKMANS EISE CAREL, KUNNEN HENRICUS J
Format Patent
LanguageEnglish
Published 02.05.2002
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:A quadrature device 1 for a communication device, receiver, transmitter, transceiver, telephone, mixer, modulator or demodulator comprises I and Q signal paths and corresponding signal paths components 2I, 2Q; 4I, 4Q; 9I, 9Q showing a mismatch. The device 1 comprises switching means 3, 3', 6, 3'', 3''' for in particular data dependently exchanging the I and Q signals in said 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 (SIGMADELTA) modulator are compensated.
Bibliography:Application Number: US20010805481