An Electronically Controllable Capacitance Multiplier with Temperature Compensation

This article introduces a capacitance multiplier employing operational transconductance amplifiers (OTAs). The provided capacitor is a floating element synthesized from a grounded capacitor. Its outstanding feature is that the capacitive value can be widely adjusted by input bias currents of the OTAs and is temperature-insensitive. The circuit construction comprises only four OTAs, three of them are single-output OTAs which are commercially available while one of them is a dual-output OTA, cooperating with a grounded capacitor. The circuit performances are depicted through PSPICE simulations, they show good agreement to theoretical anticipation. An application as a fifth-order Chebyshev high-pass filter is included to confirm the usability of proposed circuit