FILTER COMPRISING ACTIVE RESISTOR, AND SIGMA-DELTA MODULATOR RIPPLE SMOOTHING CIRCUIT OF CAPACITIVE MICRO-ACCELERATION SENSOR USING SAME

摘要

A filter according to the present embodiment comprises: an active resistor comprising a level shift unit, which receives an input signal so as to provide a control voltage formed by shifting up the level of the input signal, and a metal oxide semiconductor (MOS) transistor operating in a deep triode region by allowing the control voltage to be applied to a control end; and a capacitor connected to the active resistor.