| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid leakage into the Rx chain of Tx signals. <P>SOLUTION: A duplex radio transceiver 50, coupled to baseband circuitry and to an antenna 32, includes a receive chain 48, a transmit chain 46, and a duplexer 49. The transmit chain includes filter components 52 and 56 that attenuate signals originating from the transmit chain in a receive frequency band by a stop-band attenuation that is approximately equal to or greater than the stop-band attenuation of the duplexer in the receive frequency band. Similarly, the receive chain includes filter components 68 and 72 that attenuate signals in a transmit frequency band by a stop-band attenuation that is approximately equal to or greater than the stop-band attenuation of the duplexer in the transmit frequency band. A bias control circuit 74 senses a power level associated with radio signals in the transmit chain and adjusts an amplifier 66 in the receive chain responsive to the power level. <P>COPYRIGHT: (C)2013,JPO&INPIT |
