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高精度抽取滤波器被广泛用于MEMS数字检波器DSP芯片的后端,它能够使检波器输出低速高品质数据以便后续保存处理.滤波器一般为等波纹FIR滤波器,在硬件实现时需要截断系数为24位定长,而直接对Remez算法得到的系数进行四舍五入截断带来的误差会严重影响阻带衰减,使滤波器阻带衰减无法达到130dB的国际标准.本文针对我国自主研发MEMS数字检波器,基于最大误差最小化准则,利用模拟退火算法优化设计了24位高精度抽取滤波器,仿真结果表明其通带响应为±0.003dB,阻带衰减达到132dB,并同时降低了2倍数据速率.本文所设计滤波器完全满足MEMS数字检波器对滤波器提出的各项性能指标,设计方法可通用于设计高精度抽取滤波器.
High-precision decimation filter is widely used in MEMS digital geophone DSP chip back end, it can make geophone output low-speed high-quality data for subsequent preservation processing.Filter is generally equiripple FIR filter, the need to cut off in hardware The coefficient is fixed at 24 bits, but the error caused by rounding off the coefficients obtained by Remez algorithm will seriously affect the stop band attenuation, so that the filter stop band attenuation can not reach 130dB international standards.In this paper, our country independently developed MEMS digital detector Based on the maximum error minimization criterion, a 24-bit high-precision decimation filter is optimized by simulated annealing algorithm. The simulation results show that the passband response is ± 0.003dB, the stopband attenuation is 132dB, and the data rate is reduced by 2 times The filter designed in this paper can fully meet the performance requirements of the MEMS digital geophone for the filter, and the design method can be used universally to design the high precision decimation filter.