摘要
在伺服系统中,为了计算出伺服位置误差信号(PES),需对伺服burst信号进行高精度采样并通过FFT计算。但目前大多数公司为了降低成本,使用带硬盘控制器芯片88i6310作为伺服读写通道控制芯片,其读写通道伺服系统都采用6位ADC转换器,并且伺服系统和数据信号共用采样电路。由于采样时会产生量化噪声干扰,因此对伺服burst信号来说6位分辨率的ADC转换器显然是不够的,经过FFT计算后burst信号会产生较大的误差。首先依据采样量化误差模型分析了现有的伺服系统过采样模型,并提出了改进型的伺服系统过采样模型。通过仿真得知,改进型采样方案将平均量化误差由原来的0.38LSB降到了0.14LSB,ADC转换器的分辨率由原来的7.5bit提高到8.8bit。
In order to calculate the serve position error signal （PES） in the serve system, it is necessary to make high definition sampling and FFT calculation for the burst signal. Based on the reference, for reducing cost purpose, most designers adopt 6-digit ADC convector in the read-write channel serve system of hard drive controller chip 88i6310, and both serve system and signal system share the sampling circuit. Because of the quantitative noise disturbing during the sampling process, it is not enough to use 6-digit ADC converter for the serve burst signal, and significant deviations exist for the burst signal with the FFT calculation. This article quantitative error model first, and provided the enhanced serve enhanced solution reduces the average quantitative error from ADC convector from 7.5 bits to 8. 8 hits. analysed the existing serve sampling statistic model by system sampling model. The simulation shows that, the 0. 38LSB to 0. 14LSB, and improves the resolution of
出处
《计算机科学》
CSCD
北大核心
2008年第11期54-55,103,共3页
Computer Science
基金
国家自然科学基金(60303031)
国家“973”重点基础研究发展计划(2004CB318203)资助
关键词
读写通道
伺服信号
重采样
数据存储
Read/write channel, Serve signal,Resampling signal, Data storage
