| 摘要 |
An architecture for a multiple-band wireless transceiver with quadrature conversion receiver and transmitter circuits. Dual dedicated local oscillators provide the necessary frequency up and down conversion signals for the transmitter and receiver circuits, respectively, thereby allowing for duplex transmit and receive operations. Each of the transmitter and receiver circuits include multiple, e.g., three, signal paths for providing multiple-band operation. In the transmitter, the outgoing baseband data is quadrature modulated. The modulated data signals are then frequency up converted using another quadrature signal mixing process which avoids any need for image signal rejection filters within the signal transmission path. Similarly, in the receiver, quadrature signal mixing is used for the frequency down conversion process, thereby avoiding any need for image signal rejection filters within the signal reception path. The down-converted data signals are then quadrature demodulated to produce the incoming baseband data.
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