论文部分内容阅读
设计并制作了用于通用可编程序横向滤波器的模拟抽头CCD,器件具有32个位于每一转移级处的分离浮置栅抽头。该器件不仅适用于少于32个抽头的任意长度滤波器,也适用于由大量器件串联而成的大于32个抽头的任意长度滤波器。本文描述器件结构和特性,并介绍器件在可编程序横向滤波器方面的应用,着重分析其实验结果。实验研究了用这种器件构成的线性相位低通、带阻和带通有限脉冲响应(FIR)滤波器。详细讨论了32个抽头的最小相移低通滤波器的设计和构成。这些滤波器响应的测量和计算值彼此十分一致。在其它应用方面,还介绍了可编程序两维均衡器。为获得抽头增益,采用了最小均方判据。检验了均衡器在频率域和时间域中的响应。结果表明,可编程序两维均衡器能有效地消除码间干扰和交叉信道干扰。
An analog tap CCD for a general purpose programmable transversal filter was designed and fabricated with 32 separate floating gate taps located at each transfer stage. The device is not only suitable for any length filter with less than 32 taps, but also for any length filter with more than 32 taps formed by connecting a large number of devices in series. This article describes the device structure and characteristics, and describes the application of the device in the programmable transversal filter, focusing on the analysis of the experimental results. The linear phase low-pass, band-stop, and band-pass finite impulse response (FIR) filters constructed with this device were experimentally investigated. The design and construction of a minimum phase shift low-pass filter of 32 taps is discussed in detail. The measured and calculated values for these filter responses are very consistent with each other. In other applications, also introduced a programmable two-dimensional equalizer. To obtain the tap gain, a minimum mean square criterion is used. The equalizer was tested for response in the frequency and time domains. The results show that the programmable two-dimensional equalizer can effectively eliminate intersymbol interference and cross-channel interference.