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    • 8. 发明授权
    • RF transceiver IC having internal loopback conductor for IP2 self test
    • RF收发器IC具有用于IP2自检的内部回送导体
    • US08606193B2
    • 2013-12-10
    • US12270755
    • 2008-11-13
    • Jin-Su KoMichael KohlmannBahman Ahrari
    • Jin-Su KoMichael KohlmannBahman Ahrari
    • H04B1/38
    • H04B1/40H03D7/168
    • An RF transceiver integrated circuit has a novel segmented, low parasitic capacitance, internal loopback conductor usable for conducting IP2 self testing and/or calibration. In a first novel aspect, the transmit mixer of the transceiver is a current mode output mixer. The receive mixer is a passive mixer that has a low input impedance. In the loopback mode, the transmit mixer drives a two tone current signal to the passive mixer via the loopback conductor. In a second novel aspect, only one quadrature branch of the transmit mixer is used to generate both tones required for carrying out an IP2 test. In a third novel aspect, a first calibration test is performed using one quadrature branch of the transmit mixer at the same time that a second calibration test is performed using the other quadrature branch, thereby reducing loopback test time and power consumption.
    • RF收发器集成电路具有新颖的分段,低寄生电容,可用于进行IP2自检和/或校准的内部环回导体。 在第一个新颖的方面,收发器的发射混频器是电流模式输出混频器。 接收混频器是具有低输入阻抗的无源混频器。 在环回模式下,发射混频器通过环回导体将两声音电流信号驱动到无源混频器。 在第二个新颖的方面,发射混频器只有一个正交分支用于产生执行IP2测试所需的两个音调。 在第三个新颖的方面,使用发射混频器的一个正交分支进行第一校准测试,同时使用其他正交分支执行第二校准测试,从而减少环回测试时间和功耗。