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Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting

A technology for digital broadcasting, front-end circuits, applied in amplitude demodulation of homodyne/synchronized circuits, electrical components, transmission systems, etc., and can solve problems such as DC offset, high sensitivity, increased implementation complexity and cost

Inactive Publication Date: 2006-06-28
TSINGHUA UNIV
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Problems solved by technology

[0010] However, the I / Q mismatch, DC offset and 1 / f noise of the zero-IF receiver limit the application of the zero-IF receiver
In the global digital radio (DRM) receiver, due to the narrow signal bandwidth, it is very sensitive to 1 / f noise, so the traditional zero-IF structure should not be used in the global digital radio (DRM) receiver
[0011] Therefore, various problems existing in the existing traditional receiver structure have brought great challenges to the design of a high-performance, low-cost global digital radio (DRM) receiver, increasing the complexity and cost of implementation

Method used

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  • Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting
  • Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting
  • Front-ene circuit of two-step double-orthogonal zero medium frequency structure receiver of global digital broadcasting

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Embodiment Construction

[0047]The technical solution of the present invention is: the radio frequency front-end structure based on two-step dual-orthogonal digital zero-IF for global digital broadcasting belongs to the global digital broadcasting technology. It is characterized in that: based on the advantages of the joint superheterodyne structure and the zero-IF structure, the two-step zero-IF technology is adopted, and the zero-IF operation process is realized by double-orthogonal mixing. The main feature of the receiver structure is to overcome the traditional superheterodyne structure receiver used in the global digital broadcasting system (DRM) at present. Serious, I / Q two-way mismatch and other disadvantages, a new improved receiver structure that combines the advantages of the two and eliminates its shortcomings is proposed, and this structure is completely in line with the current research and development direction of integrated circuits.

[0048] Its embodiment A step is as figure 1 Shown:...

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Abstract

This invention relates to a global digital broadcast technology characterizing in applying two step double orthogonal zero IF including the following steps: transforming a RF signal to a high IF then to be switched to a base band directly via a double orthogonal mixed frequency structure. In practice, two different modes can be applied according to the different places set for the A / D converter by digitalizing after the first time of mixing the frequency then carrying out a second time orthogonal mixing and digitalization after that, which overcomes the shortcoming of converting frequencies for many times of the traditional superheterodyne receivers used at present in the global digital broadcast system

Description

technical field [0001] The invention relates to a novel receiver front-end circuit, which is especially suitable for the design of the global digital radio (DRM) receiver. Background technique [0002] In April 2001, ITU passed the global digital broadcasting scheme below 30MHz submitted by DRM, the global digital broadcasting organization. Its signal bandwidth is divided into three working modes: 5k, 10k, and 20k. The program aims to digitize the current analog broadcasting to achieve CD-like sound quality. With the rapid development of integrated circuit manufacturing technology and the continuous improvement of design tools, digital integrated circuit design capabilities are constantly improving, and the reduction of process line width brings great challenges to analog and front-end circuit design. Therefore, in In global digital broadcasting receivers, the front-end structure of the receiver has become one of the main bottlenecks restricting the performance of the recei...

Claims

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Application Information

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IPC IPC(8): H04B1/30H03D1/22
Inventor 孙耀晖杨华中
Owner TSINGHUA UNIV
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