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Dynamic Range

The dynamic range of a filter is defined as the ratio between the maximal and minimal signal levels it can process. The maximal signal level is determined by the distortion in the filter; the minimum signal level is determined by the amount of noise produced by the filter. Generally, dynamic range is expressed in dB. The dynamic range is the most important design parameter of active filters, for two reasons.

Firstly, for many applications the dynamic range of active filters is not or barely enough. This makes careful optimization of the dynamic range very important.

Secondly, the chip area and the power consumption of integrated active filters are proportional to the dynamic range. Each 3dB obtained from optimization reduces chip area and power consumption by a factor two.

FA can evaluate and optimize the dynamic range of active filters.



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2009-06-03