Abstract
In this work, we propose a resistorless realization of the simple capacitance multiplier circuit with electronically controllable using a single voltage differencing gain amplifier (VDGA) as an active building block. The circuit utilizes one VDGA and only one capacitor in a simple circuit configuration. The proposed capacitance multiplier circuit can be tuned electronically with the adjustment of the transconductance gains of the VDGA. To emphasis the workability of the proposed circuit, the second-order RC low-pass filter is constructed as an application example. PSPICE simulations are performed to verify the theory.
Highlights
Integrable high-valued capacitances are necessary and often used in several analog integrated applications, such as sensor interfacing circuits, monolithic phase-locked loops, sample-and-hold data systems, and implantable biomedical systems [1,2,3]
This paper proposes a voltage differencing gain amplifier (VDGA)-based capacitance multiplier circuit
To confirm the analytical calculation, the simulation results with TSMC 0.25-μm CMOS technology are reported
Summary
Integrable high-valued capacitances are necessary and often used in several analog integrated applications, such as sensor interfacing circuits, monolithic phase-locked loops, sample-and-hold data systems, and implantable biomedical systems [1,2,3]. The active element-based capacitance multipliers proposed in [6], [8,9,10], [12,13], [1721] are designed with two or more passive elements. These would need relatively high power dissipation and large silicon area on the chip. This paper proposes a voltage differencing gain amplifier (VDGA)-based capacitance multiplier circuit. To confirm the analytical calculation, the simulation results with TSMC 0.25-μm CMOS technology are reported
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