Abstract
The basic principle of log-domain circuits is introduced and its suitability for the realization of low-voltage (LV) and low-power (LP) continuous-time filters is established. The main limitations of practical implementations including noise are discussed and the advantage of the combination of companding and class AB operation is highlighted. Examples of BiCMOS and standard digital CMOS realizations operating at supply voltages as low as 1 V are presented. A comparison between classical gm-C and log-domain continuous-time filters is drawn on the basis of the power consumption per pole and edge frequency normalized to the dynamic range. This comparison shows that log-domain filters are more power saving than more traditional filters.
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