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    • 1. 发明授权
    • Transceiver circuit arrangement and method
    • 收发电路的布置和方法
    • US06950634B2
    • 2005-09-27
    • US10154126
    • 2002-05-23
    • Jeffrey A DykstraNebil Tanzi
    • Jeffrey A DykstraNebil Tanzi
    • H04B1/52H04B1/44H04B1/46
    • H04B1/52
    • A doubly balanced transceiver system having a transmit terminal (TX), a receive terminal (RX), and an an antenna terminal (ANTENNA), 180° hybrids (201, 240), 90° hybrids (204, 304, 235 and 335), a power amplifier (230, 330) and a RX/TX switch (220) for disabling the power amplifier so that signals received at the transmitter are reflected to the receive terminal (RX). The 180° hybrids (201, 240) preferably split and re-combine signals into parallel paths. A loopback test mode is preferably provided by use of an antenna isolation switch (302) to enable a power detect terminal (POWER_DETECT). This eliminates pricey and problematic GaAs switches, and allows the use of low cost silicon for the power amplifier. The doubly balance architecture also has the advantage of eliminating common-mode noise, and reflection problems with the PA gain stages. Additionally, greater power can be extracted from the power amplifier. Further the arrangement has less insertion loss compared to a GaAs switch. Also, dependant upon system specifications, it may be possible to eliminate harmonic filtering at the power amplifier output.
    • 具有发射终端(TX),接收终端(RX)和天线终端(ANTENNA),180°混合(201,240),90°混合(204,304,235和335)的双平衡收发器系统 ,功率放大器(230,330)和用于禁用功率放大器的RX / TX开关(220),使得在发射器处接收的信号被反射到接收终端(RX)。 180°混合器(201,240)优选地将信号分离并重新组合成并行路径。 优选地,通过使用天线隔离开关(302)来提供环回测试模式以使能功率检测终端(POWER_DETECT)。 这消除了昂贵且有问题的GaAs开关,并且允许使用低成本硅作为功率放大器。 双平衡架构还具有消除共模噪声和PA增益级反射问题的优点。 此外,可以从功率放大器提取更大的功率。 此外,与GaAs开关相比,该布置具有较少的插入损耗。 此外,依赖于系统规格,可以消除功率放大器输出端的谐波滤波。