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    • 46. 发明授权
    • Squelch detection method and circuit using rectifying circuit for detecting out-of-band signal
    • 静噪检测方法和电路采用整流电路检测带外信号
    • US08513981B2
    • 2013-08-20
    • US13316737
    • 2011-12-12
    • Xin LiuArvind Bomdica
    • Xin LiuArvind Bomdica
    • H03K5/22
    • H03F3/45179H03F3/45632H03F3/505H03F2200/78H03F2203/45394H03F2203/45418H03F2203/45478H03F2203/45562H03F2203/45648
    • A circuit for detecting out-of-band signals is disclosed. In one embodiment, the circuit includes a first differential circuit configured to level shift and positively rectify a differential input signal to produce a first output component of a differential output signal. The first differential circuit is further configured to generate and provide a common mode voltage of the differential input signal as a second component of the differential output signal. The circuit further includes a second differential circuit configured to level shift and output first and second fixed voltages based on an input reference voltage and a ground voltage. The circuit is configured to provide the differential output signal and the first and second fixed voltages to an indicator circuit configured to assert an indication responsive to detecting that a differential voltage of the differential output signal is greater than a differential voltage of the first and second fixed voltages.
    • 公开了一种用于检测带外信号的电路。 在一个实施例中,电路包括第一差分电路,其被配置为对差分输入信号进行电平移位和正整流以产生差分输出信号的第一输出分量。 第一差分电路还被配置为产生并提供差分输入信号的共模电压作为差分输出信号的第二分量。 该电路还包括第二差分电路,其被配置为基于输入参考电压和接地电压来电平移位和输出第一和第二固定电压。 电路被配置为将差分输出信号和第一和第二固定电压提供给指示器电路,该指示器电路被配置为响应于检测到差分输出信号的差分电压大于第一和第二固定的差分电压而断言指示 电压。