TITLE:
Realization of Inverse Filters Using IC LT1228 with Grounded Capacitors
AUTHORS:
Amber Khan, Mohd Siddiq Mohsin, Mohd Danish Asad, Ishanvi Prasad, Dinesh Prasad
KEYWORDS:
Inverse Active Filters, LT1228, Operational Transconductance Amplifier (OTA), Current Feedback Amplifier (CFA), Grounded Capacitors, Analog Signal Processing, Electronic Tunability
JOURNAL NAME:
Circuits and Systems,
Vol.17 No.1,
January
30,
2026
ABSTRACT: This paper presents the design and simulation of grounded-capacitor inverse active filters using the LT1228 IC, integrating OTA and CFA for tunable, wide-band operation. Inverse filters are characterized by a frequency response that inversely complements that of standard filters. Three filters—Inverse High Pass, Low Pass, and Band Pass—were modeled in Multisim and analyzed in MATLAB. Results confirmed accurate inverse frequency response, ideal for distortion compensation and modern analog signal processing.