An Economical Class of Droop-Compensated Generalized Comb Filters: Analysis and Design

作者：Jovanovic Dolecek G; Laddomada Massimiliano

来源：IEEE Transactions on Circuits and Systems II-Express Briefs, 2010, 57(4): 275-279.

DOI：10.1109/TCSII.2010.2043469

• Cascaded integrator-comb (CIC) filters
• comb
• decimation
• decimation filter
• delta-sigma
• generalized comb filter (GCF)
• power-of-2 (PO2)
• sinc filters

In this brief, we address the design of economical recursive generalized comb filters (GCFs) by proposing an efficient technique to quantize the multipliers in the z-transfer function employing power-of-2 (PO2) terms. GCFs are efficient anti-aliasing decimation filters with improved selectivity and quantization noise rejection performance around the so-called folding bands with respect to classical comb filters. The proposed quantization technique guarantees perfect pole-zero cancelation in the rational z-transfer function of the GCFs, thus totally avoiding instability problems. Moreover, we propose the use of a simple droop compensator for the sake of recovering the passband droop distorting the useful digital signal in the baseband. A design example is proposed with the aim of showing the application of the proposed technique, and a practical architecture of a sample third-order GCF is discussed.

• 出版日期2010-4