DRM receiver radio frequency receiving front-end circuit
A technology of radio frequency reception and front-end circuits, applied in the field of communication, can solve the problems of high price, network planning method and system parameters that need to be determined by experiments, and confidentiality
Inactive Publication Date: 2008-03-05
TIANJIN UNIV
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Problems solved by technology
[0015] At present, the research and development of DRM is a hot field in the world, and it has attracted extensive attention from the broadcasting, scientific and industrial circles. Although the developed countries started earlier and have gained some experience, the network planning method and system parameters still need to be determined through experiments.
Moreover, most of the receivers used now are experimental receivers. The volume and power consumption are not up to the requirements of mobile and portable receivers, and the cost is relatively high. These problems need to be solved by developing large-scale integrated circuits and opening up markets.
[0016] There are already RF front-end receivers sold abroad, but the price is expensive, and the internal circuit technical data is confidential, we cannot get
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[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0030] Fig. 1 is a hardware block diagram of a complete DRM receiver system test platform. The part inside the dotted line in the figure is the diagram of the front-end circuit device of the radio frequency (RF) receiving of the DRM receiver. The platform includes modules such as DRM receiver RF front-end receiving circuit, A / D conversion, data buffer and local controller, leaving analog audio output interface, USB interface and communication interface with DaVinciEVM board. The analog audio signal received by the RF front end can be sent to the PC through the sound card, or the digital signal converted from the analog audio signal by a dedicated audio A / D can be sent to the PC through the USB interface, and the algorithm can be verified by the DRM receiving software loaded on the microcomputer And the correctness of the circuit design; at th...
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The front-end circuit includes power supply management circuit, radio-receiving circuit (RRC) of analogy radio set (ARS), and secondary frequency converting circuit. RRC of ARS is in use for receiving radio signal in digital radio modulation (DRM), and converting down frequency to 465kHz intermediate frequency signal (IFS). The secondary frequency converting circuit includes divider circuit, dc blocking filter circuit, mixer circuit, and local oscillation circuit. Through the divider circuit and the dc blocking filter circuit, 465kHz IFS input from RRC of ARS is connected to mixer circuit. Then, the mixer circuit converts 465kHz IFS down to 12kHz IFS. The local oscillation circuit is in use for providing sinusoidal local oscillation signal for the mixer circuit. Comparing with overseas product, the disclosed front-end circuit possesses features of low cost, and easy of implementation. The front-end circuit is accorded with current standard of AM receiver.
Description
technical field [0001] The invention belongs to the technical field of communication, and relates to a radio frequency receiving front-end circuit of digital amplitude modulation radio (DRM)'. Background technique [0002] At present, the digital sound broadcasting system includes satellite digital sound broadcasting DSB (Digital Satellite Broadcasting), digital audio broadcasting DAB (Digital Audio Broadcasting) and digital amplitude modulation broadcasting DRM (Digital Radio Mondiale) in three ways. Among them, digital satellite broadcasting cannot be applied in the terrestrial broadcasting transmission system; DAB is a digital technology for sound broadcasting in the 30MHz~3000MHz frequency band, which cannot meet the digitalization requirements of AM broadcasting; while working below 30MHz, the increasingly mature DRM technology can be very Well solved the digitization problem of analog AM broadcasting, the DRM system is designed as the ultimate replacement of the curren...
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IPC IPC(8): H04L27/06H04B1/16
Inventor 马永涛刘开华陈尧
Owner TIANJIN UNIV