On-chip active decoupling capacitors for regulating voltage of an integrated circuit

On-chip active decoupling capacitors for regulating voltage of an integrated circuit, comprising:

• a reference voltage generator for generating a reference voltage;
• a latch-based comparator electrically connected with the reference voltage generator for comparing the reference voltage and a supply voltage of the integrated circuit and outputting a comparison result;
• and
• switched decoupling capacitors (DECAPs) electrically connected between a high voltage node and a low voltage node of a power grid of the integrated circuit and comprising at least two capacitors and a plurality of switches, wherein according to the comparison result outputted from the latch-based comparator the switched DECAPs couples the at least two capacitors into the parallel configuration to sink current when the supply voltage is larger than an upper limit voltage, and couples the at least two capacitors into the series configuration to source current when the supply voltage is smaller than a lower limit voltage.