Digital-analog integrated electronic tuner
An electronic tuning and housing technology, applied in the direction of TV, electrical components, color TV, etc., can solve the problems of high cost and complicated circuit, and achieve the effect of low cost, simple circuit, and reducing the interference of digital signals.
Inactive Publication Date: 2010-06-09
SHAANXI LINGHUA ELECTRONICS
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Problems solved by technology
The whole circuit is complex and expensive
Method used
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[0009] combined with figure 1 , 2 , 3 describe an embodiment of the present invention.
[0010] A digital-analog integrated electronic tuner, the housing (1) is provided with a printed circuit board, the housing (1) is provided with a signal input port (2) and a signal output port (3), and the signal input port ( 2) is a radio frequency signal input port, and the signal output port (3) is a group of pin headers. The printed circuit board is provided with an input circuit, a tuning circuit and an SAW filter; the input terminal of the input circuit is connected to an analog or digital signal input port (2), the output terminal of the input circuit is connected to the input terminal of the tuning circuit, and the output terminal of the tuning circuit The terminal is connected to the input terminal of the mixing circuit of the frequency mixing intermediate frequency amplifier integrated circuit, and the analog intermediate frequency signal output by the output terminal of the fr...
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The invention relates to a digital-analog integrated electronic tuner. A shell of the tuner is internally provided with a printed circuit board and externally provided with a signal input port and a signal output port. The input end of an input loop is connected with an analog or digital signal input port, and the output end of the input loop is connected with the input end of a tuning loop; the output end of the tuning loop is connected with a mixer circuit input end of a mixing and intermediate frequency amplifier integrated circuit, analog intermediate frequency signals output by a mixer circuit output end of the mixing and intermediate frequency amplifier integrated circuit are connected with the signal output port, and output digital intermediate frequency signals are connected with the input end of a surface acoustic filter; and the output end of the surface acoustic filter is reconnected into an amplifier circuit input end of the mixing and intermediate frequency amplifier integrated circuit, and digital signals output by an amplifier circuit output end of the mixing and intermediate frequency amplifier integrated circuit are connected with the signal output port. The intermediate frequency amplifier circuit of a digital part and a mixer circuit of a preceding stage are completed in the same integrated circuit so as to reduce external interferences to digital signals by the routing direction of signals and the configuration problem on the ground. The electronic tuner has simple circuit and lower cost and is mainly used for a matched digital and analog compatible color television receiver.
Description
technical field [0001] The invention relates to a digital-analog integrated electronic tuner, which is a digital-analog integrated electronic tuner for a digital-analog television receiver. Background technique [0002] The digital-analog integrated electronic tuner of the same type in the prior art uses two integrated circuits for frequency mixing and intermediate frequency amplification. The input analog or digital signal enters the mixing integrated circuit through the input circuit and the tuning circuit, and outputs the intermediate frequency signal. The analog intermediate frequency signal enters the demodulation circuit of the subsequent stage to demodulate the audio and video signal; the digital signal enters the intermediate frequency after passing through the SAW filter. Amplifies the integrated circuit, and then outputs a balanced digital signal. The whole circuit is complicated and the cost is high. Contents of the invention [0003] The technical problem sol...
Claims
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Inventor 许会玲王冬杰
Owner SHAANXI LINGHUA ELECTRONICS