Chebyshev comb compensation filter based on FPGA

Abstract

Abstract: For the advantage of simple structure and good anti-aliasing, Cascaded integrator comb (CIC) filter has been widely used in a variety of signal processing systems. Aiming at the problem of large passband distortion and small stopband attenuation of the traditional CIC filter, a Chebyshev cascade integral comb ( C-CIC ) filter is proposed by analyzing the characteristics of CIC filter. The simulation results using MatLab show that compared with the traditional CIC, interpolated second-order polynomial cascade integral comb filter (ISOP-CIC) and cosine integral comb filter（CIC-COSINE）, the C-CIC filter has a large improvement in passband distortion at fc and stopband attenuation at fa when the number of CIC cascades is the same. According to the Quartus simulation, the C-CIC filter consumes less on-chip resources than the ISOP-CIC and CIC-COSINE filters when the same amplitude-frequency characteristics are achieved. It is indicated that the C-CIC filter can be better used in tunable diode laser absorption spectrometer （TDLAS） system.

Key words: spectroscopy, Chebyshev comb compensation filter, windows function, cascaded integrator comb filter, FPGA

CLC Number:

TN713

CHEN Zhi , WU Bin. Chebyshev comb compensation filter based on FPGA[J]. Chinese Journal of Quantum Electronics, 2020, 37(1): 15-21.

References

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