公开(公告)号：US06785324B1

公开(公告)日：2004-08-31

申请号：US09426847

申请日：1999-10-26

申请人： Richard Douglas Schultz ,  Raphael Leite B. Matarazzo

发明人： Richard Douglas Schultz ,  Raphael Leite B. Matarazzo

IPC分类号： H04B138

CPC分类号： H04B1/525 ,  H04B1/18 ,  H04L5/14

摘要： A full-duplex radio transceiver includes a transmitter and a receiver. A duplexer is connected to an output of the transmitter and an input of the receiver. The receiver includes a low noise amplifier having a nonlinear portion capable of generating undesired cross-modulation signals based upon a portion of the transmit signal coupled thereto from the duplexer and a signal from another adjacent transmitter. A bandpass filter is connected to an output of the low noise amplifier, and at least one downconverter stage is connected to an output of the bandpass filter. A reactive termination circuit is connected between the low noise amplifier and the bandpass filter for changing an impedance presented to the output of the low noise amplifier with respect to signals from the colocated transmitter to thereby reduce undesired cross-modulation signals.

摘要翻译： 全双工无线电收发器包括发射机和接收机。 双工器连接到发射器的输出端和接收器的输入端。 接收机包括具有非线性部分的低噪声放大器，该非线性部分能够基于从双工器耦合到其上的发射信号的一部分和来自另一相邻发射机的信号产生不期望的交叉调制信号。 带通滤波器连接到低噪声放大器的输出，并且至少一个下变频器级连接到带通滤波器的输出端。 反相终端电路连接在低噪声放大器和带通滤波器之间，用于相对于来自共定位发射机的信号改变呈现给低噪声放大器的输出的阻抗，从而减少不期望的交叉调制信号。