Reduction of transmitter induced cross modulation in a receiver

摘要

A transceiver is disclosed having a baseband unit which outputs baseband signals and a modulator which modulates the baseband signals to output a modulated signal. A transmitter amplifier amplifies the modulated signal and outputs a transmit signal to a duplexer. The transceiver further includes a receive amplifier which receives a receive signal from the duplexer, where the receive amplifier has a gain which is modulated by an envelope signal which is proportional to the transmit signal, such as being proportional to the power or square root of the power of the transmit signal. The envelope signal is provided by either the baseband unit or by an envelope detector which receives the output of the receive amplifier. The envelope signal may also be provided by a rectifier which rectifies the output of the receive amplifier.