Study Of IIR Filters Based On HDPLD

Digital filters provide a important function in digital signal processing design,and are used in a wide variety of applications such as signal separation,restoration,or shaping. IIR filters are a kind of digital filters with recursive structure and are primarily used for high data throughput applications that can tolerance phase distortion and require a sharp cut-off characteristic. In engineering practice,there is always a real-time and flexible request for signal processing,however,software and hardware technique available for implementation are difficult to meet the demand for the two aspects.From the request of practical applications,the dissertation studies a practical and technological problem about making use of HDPLD to implement IIR filters. According to the basic theory of IIR filters, a scheme of hardware implementation is worked out combining with the fact that coefficients of numerator and denominator of transfer function are fixed and the structural feature of selected HDPLD. From the clew of implementing a stratified,modularized and parameterized design,the thesis describes the hardware implementation of the IIR filter with VHDL and schematic diagram design method. Two examples that are IIR notch filter and IIR low-pass filter are given,the stability of filters and the effects of quantification of coefficient are also analyzed. The accomplished design of IIR filter is configured into chip and is tested in experimental circuit after configured.Using Altera's powerful developing software MAXPLUS II,design entry,design processing and design verification are carried out for all functional modules,and so the whole design is accomplished. The EP1K10TC100 which is belong to Altera's ACEX 1K series is selected to be configured. In experiment,multiform input signals are used. The experiment result indicates that the implemented filter has good performance,which validates the design is correct. Modifying the parameters can realize all kinds of IIR filters with different precision. Accordingly,it is proved that the parameterized design based on HDPLD is flexible.