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Low-noise down converter to convert received signal into MF signal

A low-noise, converter technology, applied in the direction of image communication, gigahertz frequency band transmission, color TV components, etc., can solve the problem of increasing costs

Inactive Publication Date: 2003-05-14
SHARP KK
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  • Abstract
  • Description
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Problems solved by technology

When using chip components, this will increase the cost

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  • Low-noise down converter to convert received signal into MF signal
  • Low-noise down converter to convert received signal into MF signal
  • Low-noise down converter to convert received signal into MF signal

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Embodiment Construction

[0024] figure 1 It exemplarily shows the transmission frequency band of the frequency band overlapping LNB to which the present invention is applied. exist Figure 9 In the band-stacked LNB shown, the 11.45-11.70GHZ signal from the satellite has H-polarized waves and V-polarized waves, which are mixed with local oscillator signals of 10.45GHZ and 10GHZ by MIX, respectively. In this way, the H polarized wave and the V polarized wave are converted into 1000-1250MHZ and 1450-1700MHZ, respectively.

[0025] In order to transmit these signals in one cable, as described above, before mixing them, the interference components are removed by HPF and LPF, respectively. In this case, an LPF is inserted in the signal line on the H-polarized wave side. LPF is needed to achieve very steep attenuation, because the difference between passband and stopband is only 200MHZ.

[0026] figure 2 represents the LPF used in one embodiment of the present invention, image 3 express as figure ...

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Abstract

In a low noise block downconverter converting a right-hand (or horizontally) polarized wave signal and a left-hand (or vertically) polarized wave signal to intermediate frequency signals, one of two filters for removal of interference waves from the intermediate frequency signals on the right-hand (or horizontally) polarized wave side and on the left-hand (or vertically) polarized wave side is formed of a plurality of stages of parallel resonant trap circuits having capacitors and inductors connected in parallel, respectively, which exhibit attenuation characteristic that is wideband and steep and allows great attenuation in the reject band. Thus, it is possible to provide a low noise block downconverter employing an LPF that achieves attenuation characteristic being wideband and steep and allowing great attenuation in the reject band with the least possible number of inductor components that would otherwise increase the cost.

Description

technical field [0001] The invention relates to a low-noise block down-converter, in particular to a low-noise block down-converter in a satellite receiver for receiving satellite broadcasts. Background technique [0002] Figure 7 is a block diagram showing the configuration of a conventional satellite broadcast receiving system. see Figure 7 , the antenna 101 receives high-frequency signals from the broadcast satellite 100 in the 12GHZ frequency band (11.45-11.70GHZ). The antenna 101 is equipped with a low noise band down converter (hereinafter referred to as “LNB”) 102 . The weak high-frequency signal of the 12 GHz band from the broadcast satellite 100 is frequency-converted into an intermediate frequency (IF) signal of the 1 GHz band, and is subjected to low-noise amplification by the LNB 102 . The final low-noise signal having a sufficient level is supplied to a digital broadcast satellite (DBS) tuner 104 connected as a next stage. The DBS tuner 104 processes the si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/20H03H7/01H03H7/075H04B1/10H04B1/18H04B1/28
CPCH03H7/1758H03H7/0115H03H2007/013H04B1/28H03H7/1766
Inventor 本山幸次
Owner SHARP KK
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