Band switching circuit and relative satellite television system thereof
A technology for band switching and switching circuits, applied in the field of band switching circuits and related satellite TV systems, can solve problems such as complex circuit structures, achieve the effects of reducing transmission loss, improving manufacturing yield, and improving signal quality
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[0042] Please refer to Figure 4 , Figure 4 It is a schematic structural diagram of an embodiment of the band conversion circuit 400 of the present invention. Such as Figure 4 As shown, the band conversion circuit 400 includes (but not limited to) a band-pass filter BPF11, a band-stop filter (band-stop filter) BSF11, a first power divider 410, a mixer 430, a local oscillator 440 , a switching circuit 460 , a microcontroller 470 , a high-pass filter HPF11 , a second power divider 450 and a low-pass filter LPF11 . The band conversion circuit 400 is used to receive a down-frequency input signal, such as figure 1 A down-converted satellite signal 100 is shown. In this embodiment, the first frequency band FB1 is 250-750 MHz, the second frequency band FB2 is 950-1450 MHz, and the third frequency band FB3 is 1650-2150 MHz, but the present invention is not limited thereto. Please note that the band conversion circuit 400 can be applied to a satellite TV system, but the present ...
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