ROMJIST Volume 29, No. 2, 2026, pp. 167-178, DOI: 10.59277/ROMJIST.2026.2.06
Ionut-Alin ILIE, Cristian Stefan ZEGHERU, Florin DUMITRU, Gheorghe BREZEANU A Novel Current-Mode Capacitor Multiplier for Improved Noise Filter
ABSTRACT: This paper presents a novel current-mode capacitor multiplier that offers a superior alternative to existing solutions. By simply adding a resistor, the proposed circuit achieves multiplied equivalent capacitance, outperforming state-of-the-art implementations. Simulation results demonstrate the circuit’s effectiveness in a noise filtering application for a voltage reference, requiring only a 100pF integrated capacitor and 2μA quiescent current to achieve a 16Hz low cut-off frequency. Compared to traditional solutions, the proposed multiplier reduces the required capacitor size from 10nF to 100pF. The new design excels in both power supply rejection ratio and noise performance, making it an attractive solution for low-power, high-precision applications.KEYWORDS: Capacitor multiplier; low-pass filter; noise; low quiescent; voltage referenceRead full text (pdf)