The odd couple: Antiresonance control by two capacitors of unequal series resistances

Low cost board-level antiresonance control method has been proposed. In the proposed method, two capacitors having equal dimensions and capacitances with different series resistances will be used to reduce impedance peak at antireso-nance while suppressing impedance increase at low frequencies. Experimental measurements using a 180-nm CMOS test chip mounted on a PCB confirmed the effectiveness of the proposed method.