Novel Two-Stage Comb Decimator
Nuevo decimador comb de dos etapas
Gordana Jovanovic Dolecek1 and Sanjit K. Mitra2
1 National Institute for Astrophysics, Optics and Electronics, Department of Electronics INAOE, Puebla, Puebla Mexico. Correo: gordana@inaoep.mx
]]> 2 University of California, Department of Electrical and Computer Engineering Santa Barbara, California USA. Correo: mitra@ece.ucsb.edu
Article received on 13/06/2011.
Accepted on 29/08/2011.
Abstract
A simple method for the design of a multiplier-less comb-based decimation filter is presented. The filter compensates the comb passband droop, and has the desired attenuation in the first folding band. The proposed structure has two decimation stages, both with simpler comb filters. The desired attenuation in the first folding band is achieved by an appropriate number of cascaded combs in the second stage. A simple compensation filter, working at a low output rate, provides the desired compensation in the pass band. The choice of the design parameters is presented along with a comparison of the proposed method to some other existing design methods.
Keyword: Comb filter, decimation, folding bands, compensation.
Resumen
]]> Se presenta un método simple para el diseño de un filtro de diezmado basado en filtro comb sin multiplicadores. El filtro compensa la caída en la banda de paso del filtro comb y tiene la atenuación deseada en la primera banda del plegado. La estructura propuesta tiene dos etapas de decimación, ambas con filtros comb simples. La atenuación deseada en la primera banda del plegado se alcanza por un número apropiado de combs en cascada en la segunda etapa. Un filtro simple de compensación trabajando en la baja razón de muestreo de salida provee la compensación deseada en la banda de paso. La elección de los parámetros de diseño es presentada junto con una comparación del método propuesto con algunos otros métodos de diseño existentes.Palabras Clave: Filtro comb, diezmado, bandas del plegado, compensación.
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