Micropower preamplifier for comparators of precision ADCs.

A preamplifier for comparators of precision low-power consumption analog-digital converters is presented. In order to lower the average consumption current of amplifier cascades, the capacitors, which fulfill the function of current sources during charging at the comparison stage, are used in them as the dynamic load. A correction circuit of the zero bias error for amplifiers of this type is developed. Modeling of the device using CMOS elements with a design rule of 0.35 μm from library XA035 of factory XFAB showed that the average current consumption at an operating frequency of 1 MHz is about 7 μA. [ABSTRACT FROM AUTHOR]