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发明公开
CN108881757A 调谐器电路、适用于调谐器的环通电路及视频广播系统 有权

调谐器电路、适用于调谐器的环通电路及视频广播系统
摘要：
本发明提供一种调谐器电路、适用于调谐器的环通电路及视频广播系统。调谐器电路具有零电力环通(ZPLT)电路，所述零电力环通电路能够即使在不被供电或者不存在独立电源时仍提供环通路径。所述调谐器电路包括输入端子、输出端子、零电力环通电路、及内部电阻器。所述输入端子接收射频(RF)信号。所述输出端子连接到下一调谐器电路。所述零电力环通电路连接在输入端子与输出端子之间。所述内部电阻器及连接在所述调谐器电路与下一调谐器电路之间的外部电阻器形成分压器，以对在输出端子处存在的偏压进行分压来对所述零电力环通电路进行使能，从而在独立电源不对所述调谐器电路供电或者低噪声放大器被使能时提供环通路径来将射频信号递送至输出端子。
摘要（英）：

The disclosure provided a tuner circuit having a zero power loop through (ZPLT) circuit that is capable of providing a loop through path even when no power is being supplied or without a standalone power supply. The tuner circuit includes an input terminal, an output terminal, a ZPLT circuit, and an internal resistor. The input terminal receives a radio frequency (RF) signal. The output terminal is connected to a subsequent tuner. The ZPLT is connected between the input terminal and the output terminal. The internal and an external resistor connected between the turner circuit and subsequent tuner form a voltage divider to divide a bias found at the output terminal to enable the ZPLT circuit for providing a loop through path to deliver the RF signal to the output terminal when the tuner circuit is not powered by a standalone power or a low noise amplifier is enabled.

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