磁存储读写通道伺服Burst信号采样模型的优化与仿真分析

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FFr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，A1X2转换器的分辨率由原来的7．5bit提高到8．8bit。

Optimization and Emulational Analysis on Sampling Model of Serve Burst Signal in Read/Write Channel of Magnetic Storage

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...