A NEW APPROACH TO THE DESIGN OF POST-DAC FILTERS

Jacek Piskorowski, Roman Kaszynski, Miguel Angel Gutierrez de Anda, Arturo Sarmiento-Reyes

Abstract

In many measurement applications, it is required to have digital-to-analog converters (DAC). All DACs use a reconstruction (anti-imaging) filter as the final step in the conversion process. Without this filter, generating a continuous-amplitude signal would not be possible. This paper presents a new theoretical concept of a post-DAC continuous-time filter. The proposed filter was designed so as to provide both a constant group delay over the desired frequency band and a maximally flat magnitude response. Moreover, the filter coefficients were varied in the time in order to accelerate the filter response. Results verifying the effectiveness of the proposed approach are presented and compared to the performance of a traditional lowpass reconstruction filter.

Keywords

analog signal processing, post-DAC filters, time-varying systems, group delay compensation

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IMEKO-WC-2009-TC4-372.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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