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

Active Publication Date: 2010-12-29
WISTRON NEWEB
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] image 3 The B-band conversion circuit 300 shown is a product currently on the market, but the realized circuit structure is relatively complicated

Method used

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  • Band switching circuit and relative satellite television system thereof
  • Band switching circuit and relative satellite television system thereof
  • Band switching circuit and relative satellite television system thereof

Examples

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Embodiment Construction

[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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Abstract

The invention relates to a band switching circuit and a relative satellite television system thereof, particularly, the band switching circuit comprises a band-pass filter, a band rejection filter, a first power divider, a local oscillator, a mixer, a switching circuit, a high-pass filter, a second power divider and a low-pass filter. The band-pass filter and the band rejection filter respectively filter an input signal with reduced frequency to generate a first filtered signal and a second filtered signal; the first power divider is coupled with the band rejection filter; the mixer is coupled with the first power divider and the local oscillator; the switching circuit is coupled with the first power divider and the mixer; the high-pass filter is coupled with the switching circuit; the second power divider is coupled with the band-pass filter and the high-pass filter; and the low-pass filer is coupled with the second power divider. The invention can simplify a circuit, reduce the overall size of a product, save the cost, lessen the transmission loss of signals, improve the signal quality of products, also can be produced on a production line in quantity so as to improve the yield of the product.

Description

technical field [0001] The invention relates to a band conversion circuit and its related satellite TV system, in particular to a band conversion circuit and its related satellite TV system which can improve signal quality and product manufacturing yield. Background technique [0002] Satellite communication systems have the characteristics of broadband and large coverage, and are widely used in the fields of detection, military, telecommunication networks, data and mobile communications. For a ground user of a satellite communication system, an antenna, a satellite down-converter (Low-noise Block Down-converter, LNB) and a demodulator are required to receive satellite signals. After the satellite signal is received by the antenna, it is down-converted to an intermediate frequency signal by the satellite down-converter, and finally demodulated by the demodulator to generate a playback signal, which is output to user devices, such as TVs. [0003] Please refer to figure 1 a...

Claims

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Application Information

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IPC IPC(8): H04N7/20
Inventor 蔡卓叡黄振家
Owner WISTRON NEWEB
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