LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method
A frequency conversion circuit and chip technology, which is applied in the field of LNB down conversion chip circuit, LNB down conversion, and LNB down conversion circuit, can solve the problems of low LNB frequency stability, large temperature drift characteristics, inconvenient maintenance and debugging, etc., and achieve saving Band-pass filter, improve frequency stability performance, and make up for the effect of low yield
Active Publication Date: 2014-04-23
RDA TECH
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Problems solved by technology
[0005] 1. The dielectric oscillator has a large temperature drift characteristic, so the frequency stability of the LNB is not high
[0006] 2. A passive band-pass filter is required to filter out the signal outside the band, especially the image part, which has improved the noise performance of the LNB. The band-pass filter has attenuation characteristics, and at the same time occupies precious board area
[0007] 3. Since the LNB is generally small in size, the large number of discrete components brings great inconvenience to maintenance and debugging
Method used
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[0028] The invention discloses a LNB down-conversion chip circuit, such as image 3 Shown, including:
[0029] The pre-amplifier receives the output of the intermediate high-amplifier of the front-end circuit and improves the noise figure of the chip to avoid degrading the noise of the entire LNB system. At the same time, it converts the single-ended signal from the intermediate high-amplifier into two differential signals to improve the chip's Common-mode noise suppression performance, the two differential signals are a first differential signal with a phase of 0 degrees and a second differential signal with a phase of 180 degrees, respectively;
[0030] The four-phase voltage-controlled oscillator outputs four local oscillator signals with a phase difference of 90°. The four local oscillator signals are the first local oscillator signal with a phase of 90 degrees, the second local oscillator signal with a phase of 0 degrees, and 270 degrees. Phase third local oscillator signal an...
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The present invention disclosed a type of LNB frequency down conversion integrated circuit. The present invention frequency-down-converts the RF signal with the Quadrature local oscillation signal (LO) and Quadrature Mixer. Then the 90 degree phase-shifting of the quadrature intermediate frequency (IF) signal after mixed is done by the use of passive Polyphase filter. The present invention further disclosed a LNB frequency down conversion chip, a LNB frequency down circuit adopting the LNB frequency down conversion chip circuit and a method of LBN frequency down. The invention ensures the elimination of the mirror image signal and the realization of the mirror image suppression function.
Description
Technical field [0001] The invention relates to a signal processing chip circuit, in particular to an LNB down-conversion chip circuit. The invention relates to an LNB down-conversion chip. The invention also relates to a signal processing circuit, especially an LNB down-conversion circuit. The invention also relates to an LNB down-conversion method. Background technique [0002] LNB, or Low Noise Block (low noise module), commonly known as tuner, is a device that is placed at the reflection focal point of the satellite receiving antenna to amplify and down-convert satellite signals. [0003] Most of the current LNBs use discrete components, including high amplifier tubes, passive bandpass filters, dielectric oscillators, mixers, intermediate frequency amplifiers, voltage stabilizing blocks, bias circuits, negative voltage generating circuits, 22k detection circuits, etc. Such as figure 1 with figure 2 Shown. [0004] The disadvantages of the traditional solution are: [0005] 1....
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IPC IPC(8): H03D7/18
CPCH04L1/0036H03D7/18H03D7/165H04N7/20H04H40/90
Inventor 魏述然尹雪松
Owner RDA TECH