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    • 145. 发明授权
    • Satellite broadcasting receiver receiving signal radio waves two broadcasting satellites
    • 卫星广播接收机接收信号无线电波两个广播卫星
    • US06985695B1
    • 2006-01-10
    • US09496038
    • 2000-02-01
    • Masahiro Kato
    • Masahiro Kato
    • H04H1/00
    • H01Q13/0258H01Q1/247H01Q25/001H03F3/189H03F3/68H03F3/72H03F2200/294H03F2200/372H04B1/18
    • A satellite broadcasting receiver (LNB) receiving signal radio waves from broadcasting satellites is provided with a low noise amplifier (LNA) amplifying a received signal, and a frequency converting circuit converting an output from the LNA to an intermediate frequency signal for output. The LNA includes four amplifiers in the first stage respectively amplifying four types of different received signals. A power supply control circuit sets a current flowing through one of four amplifiers at a prescribed value and sets currents flowing through all the other amplifiers at 0. Thus, the output from only one amplifier is supplied to the amplifier in the second stage for amplification and further applied to the frequency converting circuit. Accordingly, the amplifiers in the first stage do not simultaneously consume currents, and a switching circuit is not necessary.
    • 从广播卫星接收信号无线电波的卫星广播接收机(LNB)设置有放大接收信号的低噪声放大器(LNA),以及将来自LNA的输出转换成中频信号以进行输出的频率转换电路。 LNA包括第一级中的四个放大器,分别放大四种不同的接收信号。 电源控制电路将流过四个放大器中的一个的电流设定为规定值,并将流过所有其他放大器的电流设置为0.因此,仅在一个放大器中的输出被提供给放大器的第二级放大器, 进一步应用于变频电路。 因此,第一级中的放大器不同时消耗电流,并且不需要开关电路。