Transceiver and method for generating and processing complex I/Q

Details Transceiver and method for generating and processing complex I/Q Transceiver and method for generating and processing complex I/Q

1996-04-18

1998-10-13

Chin, Stephen

Pulse or digital communications

Transceivers

375219, 375325, 375326, 375327, 375328, 375344, 329308, 331 12, 455 74, 455 76, 455260, 455264, 455314, 455324, H04B 138

Patent

active

058223665

ABSTRACT:
The invention relates to a transceiver for generating complex I/Q-signals on a transmission frequency (f.sub.TX) and for receiving them on a reception frequency (f.sub.RX). The device comprises a first frequency synthesizer (41) for forming a first mixer signal (f.sub.LI) for the mixer (42) of the first branch that mixes the I-component of the received signal into a lower-frequency I-signal, and a second frequency synthesizer (411, 49, 46) for forming a second mixer signal (f.sub.LQ) for the mixer (421) of the second branch that mixes the Q-component of the received signal into a lower-frequency Q-signal. The device further comprises control means (45) first for directing the phase of the first (f.sub.LI) and the second (f.sub.LQ) mixer signals into the same phase in the mixing effects thereof and, thereafter, into a 90 degree mutual phase shift in the mixing effects thereof when receiving signals for bringing the lower-frequency I- and Q-signals into a 90 degree mutual phase shift.

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patent: 5325075 (1994-06-01), Rapeli
patent: 5390168 (1995-02-01), Vimpari
patent: 5471652 (1995-11-01), Hulkko
patent: 5511235 (1996-04-01), Duong et al.

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