| PCM编解码器中高性能开关电容滤波器设计 |
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| 引用本文： | 左海洋,马成炎,孙玲玲,冯炳军. PCM编解码器中高性能开关电容滤波器设计[J]. 电子器件, 2010, 33(6). DOI: 10.3969/j.issn.1005-9490.2010.06.028 |
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| 作者姓名： | 左海洋 马成炎 孙玲玲 冯炳军 |
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| 作者单位： | 杭州电子科技大学电子信息学院,杭州,310037;杭州中科微电子有限公司,杭州,310053 |
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| 基金项目： | 杭州中科微电子有限公司AT9501项目资助 |
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| 摘 要： | 基于PCM(Pulse-Code-Modulation, 脉冲编码调制)语音编解码器设计了其中的发送端开关电容滤波器,包括高通滤波器和低通滤波器.对高通滤波器和低通滤波器的设计分别采用两种不同的方法--级联法和梯形法,然后把这两部分级联起来就实现了带通滤波器.仿真结果表明开关电容带通滤波器通带波纹0.24 dB,阻带衰减37 dB,对60 Hz以下频率的衰减大于32 dB,动态范围达到90 dB,满足D4信道处理单元发送滤波器的技术要求[1].设计的开关电容滤波器在一款PCM语音编解码芯片中成功实现.
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| 关 键 词： | 开关电容 高通滤波器 低通滤波器 带通滤波器 运算放大器 脉冲编码调制 |
A High Performance SC Filter Design for PCM CODEC |
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| ZUO Haiyang,MA Chengyan,SUN Lingling,FENG Bingjun. A High Performance SC Filter Design for PCM CODEC[J]. Journal of Electron Devices, 2010, 33(6). DOI: 10.3969/j.issn.1005-9490.2010.06.028 |
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| Authors: | ZUO Haiyang MA Chengyan SUN Lingling FENG Bingjun |
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| Abstract: | Based on PCM voice CODEC, a design is accomplished for the transmittingSC (switched capacitor) filters, including high-pass and low-pass sections. For the two filters, cascade approach and ladder approach are adopted, respectively. Through cascading the two sections the band-pass filter is implemented. Simulation results show that, frequency characteristic of the band-pass filter is: passband ripple ±0.12dB,stopband rejection 37dB. For frequency less than 60Hz the attenuation is more than 32dB.All those meet the D4 channel bank specifications. It is successfully realized in the PCM voice CODEC integrate circuit. |
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| Keywords: | switched capacitor high-pass filter low-pass filter band-pass filter operational amplifier PCM |
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