Pipelined Lattice WDF Design for Wideband Digital Filters

Abstract

When a digital filter transfer function is implemented using a digital system, it invariably involves quantization of signals and coefficients in the system. The effects of quantization in most IIR digital filters can be improved by realizing the transfer function in terms of a cascade or parallel arrangement of second-order filter sections instead of a direct-form realization. However, for narrow/wideband sharp-transition filters, high sensitivity problems occur even with second-order sections since most of the poles are very close to the unit circle. In this case, the WDF, which is based upon the digital simulation of classical lossless filters, can be a good solution. In some applications, however, the required word-length is still quite high even with WDFs.KeywordsDigital FilterTransition BandwidthDigital DomainElliptic FilterRoundoff NoiseThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.