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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 to improve frequency converters, broadcast receiving circuits, electrical components, etc., can solve the problems of low frequency stability of LNB, large temperature drift characteristics, inconvenient maintenance and debugging, etc., so as to save bandpass filtering device, improve frequency stability performance, and make up for the effect of low yield rate

Active Publication Date: 2011-09-28
RDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method
  • LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method
  • LNB (low noise block) down-conversion chip circuit and LNB down-conversion chip as well as LNB down-conversion circuit and method

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Embodiment Construction

[0028] The invention discloses an LNB down-conversion chip circuit, such as image 3 shown, including:

[0029] The pre-amplifier receives the output of the intermediate amplifier of the front-end circuit and improves the noise figure of the chip to avoid deteriorating the noise of the entire LNB system. Common mode noise suppression performance, the two differential signals are respectively a first differential signal with a phase of 0 degrees and a second differential signal with a phase of 180 degrees;

[0030] The four-phase voltage-controlled oscillator outputs four local oscillator signals with a phase difference of 90°, the four local oscillator signals are respectively the first local oscillator signal with a 90-degree phase, the second local oscillator signal with a 0-degree phase, and the The third local oscillator signal of the phase and the fourth local oscillator signal of the 180 degree phase;

[0031] The quadrature mixer receives the four local oscillator sig...

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Abstract

The invention discloses an LNB (low noise block) down-conversion chip circuit and an LNB down-conversion chip as well as an LNB down-conversion circuit and method by using the LNB down-conversion chip circuit. A quadrature LO (local oscillator) and a quadrature mixer are used to carry out the down-conversion on RF (radio frequency) signals, and then a passive polyphase filter is utilized to carry out 90-degree phase shift on mixed quadrature intermediate-frequency signals, thereby ensuring filtering of image signals and realizing an image rejection 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, in particular to an LNB down-conversion circuit. The invention also relates to an LNB down-conversion method. Background technique [0002] LNB, Low Noise Block (Low Noise Block), commonly known as a tuner, is a device placed at the reflection focus of a satellite receiving antenna to amplify and down-convert satellite signals. [0003] Most of the current LNBs use discrete components, including high-amplifier tubes, passive band-pass filters, dielectric oscillators, mixers, intermediate frequency amplifiers, voltage regulators, bias circuits, negative voltage generation circuits, and 22k detection circuits. like figure 1 and figure 2 shown. [0004] The disadvantages of traditional solutions are: [0005] 1. The dielectri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/18
CPCH04L27/14H04L1/0036H03D7/18H03D7/165H04N7/20H04L27/38H04H40/90
Inventor 魏述然尹雪松
Owner RDA TECH
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