Skip to main content
Article thumbnail
Location of Repository

Quantization effects in the polyphase N-path IIR structure

By A.M. Krukowski, R.C.S. Morling and I. Kale

Abstract

Polyphase IIR structures have recently proven themselves very attractive for very high performance filters that can be designed using very few coefficients. This, combined with their low sensitivity to coefficient quantization in comparison to standard FIR and IIR structures, makes them very applicable for very fast filtering when implemented in fixed-point arithmetic. However, although the mathematical description is very simple, there exist a number of ways to implement such filters. In this paper, we take four of these different implementation structures, analyze the rounding noise originating from the limited arithmetic wordlength of the mathematical operators, and check the internal data growth within the structure. These analyses need to be done to ensure that the performance of the implementation matches the performance of the theoretical design. The theoretical approach that we present has been proven by the results of the fixed-point simulation done in Simulink and verified by an equivalent bit-true implementation in VHDL

Topics: UOWSAT
Year: 2002
OAI identifier: oai:westminsterresearch.wmin.ac.uk:4344
Provided by: WestminsterResearch

Suggested articles

Citations

  1. (1995). A high-fidelity decimator chip for the measurement of sigma–delta modulator performance,”
  2. (1983). Digital signal processing schemes for efficient interpolation and decimation,”
  3. Digital signal processing with efficient polyphase recursive all-pass filters,” in
  4. (2002). Dynamic range of allpass filter structures,” in
  5. (2000). Estimation for the quantization noise spectrum of linear digital filter,” in
  6. (1991). On coefficient-quantization and computational roundoff effects in lossless multirate filter banks,”
  7. (1999). Quantization noise analysis of wave digital and lossless digital integrator allpass/lattice filters,” in
  8. (1987). Recursive N th-band digital filters—Part II: Design of multistage decimators and interpolators,”
  9. (1997). Roundoff noise analysis of modified delta operator direct form structures,” in
  10. (1996). Roundoff noise analysis on the basis of an improved floating point error model,” in

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.