CAPACITIVELY COUPLED CURRENT BOOST CIRCUITRY FOR INTEGRATED VOLTAGE REGULATOR

摘要

A current boost circuit that supplies additional current to a voltage reference power rail (Vref). When the voltage reference power rail (Vref)drops due to an excessive current demand from the load (ca, cb), the drop is sensed and a switch (p1, p2) is activated supplying additional current to the voltage reference rail (Vref). A gain stage (GAIN) is capacitively coupled to the reference voltage (Vref) and any drop is transferred through this capacitor (C1, C2) to a gain stage (GAIN) that amplifies the drop. The amplified drop is capacitively coupled to a solid state switch (P1, P2) that turns on connecting an additional current source (VCC) to the reference voltage rail (Vref). The solid state switch (P1, P2) is biased just below its turn on threshold.