现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2015年
9期
77-79,82
,共4页
过采样%插值滤波器%Σ-Δ调制器%噪声整形
過採樣%插值濾波器%Σ-Δ調製器%譟聲整形
과채양%삽치려파기%Σ-Δ조제기%조성정형
over-sampling%interpolation filter%Σ-Δ modulator%noise shaping
给出一种可用于信号功率放大设备，基于Σ?Δ调制方式的信号调制系统的设计方法。此系统首先将信号通过插值滤波器，利用过采样技术减少频带内的量化噪声，再将信号通过Σ?Δ调制器，利用噪声整形技术把频带里的量化噪声推向高频，并利用低通滤波器滤除，得到高信噪比的1?bit数字流。将此系统采用Simulink仿真建模，结果表明，基带内信噪比可达90 dB，在工程上具有一定应用价值。
給齣一種可用于信號功率放大設備，基于Σ?Δ調製方式的信號調製繫統的設計方法。此繫統首先將信號通過插值濾波器，利用過採樣技術減少頻帶內的量化譟聲，再將信號通過Σ?Δ調製器，利用譟聲整形技術把頻帶裏的量化譟聲推嚮高頻，併利用低通濾波器濾除，得到高信譟比的1?bit數字流。將此繫統採用Simulink倣真建模，結果錶明，基帶內信譟比可達90 dB，在工程上具有一定應用價值。
급출일충가용우신호공솔방대설비，기우Σ?Δ조제방식적신호조제계통적설계방법。차계통수선장신호통과삽치려파기，이용과채양기술감소빈대내적양화조성，재장신호통과Σ?Δ조제기，이용조성정형기술파빈대리적양화조성추향고빈，병이용저통려파기려제，득도고신조비적1?bit수자류。장차계통채용Simulink방진건모，결과표명，기대내신조비가체90 dB，재공정상구유일정응용개치。
A design method of Σ?Δ signal modulation system is provided to apply in signal power amplifier equipment. First?ly,signal is passed through the interpolation filter in the modulation system,and the quantization noise is reduced by over?sam?pling technical. Then the signal is passed through Σ?Δ modulator,the quantization noise in the band is pushed to high frequen?cy by noise shaping technique and removed though low pass filter,finally 1?bit digital flow of high signal to noise ratio is ob?tained. Simulation and modeling results by simulink indicate that the signal to noise ratio is reachable to 90 dB in base band,it has certain application value in project.
