Single VDTA-based Lossless and Lossy Electronically Tunable Positive and Negative Grounded Capacitance Multipliers

Abstract

This paper proposes realization of simple electronically adjustable grounded capacitance multiplier (GCM) circuits using a single voltage differencing transconductance amplifier (VDTA) as an active building block, with one floating capacitor with/without a grounded resistor. The proposed capacitance multipliers circuits can be tuned electronically using VDTA transconductance gain adjustment. The sensitivity analysis of multiplication factors was performed in ideal and non-ideal conditions, while the influence of parasitic elements on the operating frequencies range was examined by mathematical analysis. To emphasize the applicability of the proposed circuits, the band-pass filter was constructed as a model for application. Functional, time, and frequency domain analyses were conducted using PSpice simulations in order to verify the theory. The temperature dependence of the example application was investigated. Monte Carlo analysis was carried out to verify the example application’s robustness against the variation of the passive elements. In addition, a comparison with circuits in the literature is made to show the superiority of the proposed GCMs.