Abstract
A new current feedback amplifier (CFA) based dual-input differentiator (DID) design with grounded capacitor is presented; its time constant (τo) is independently tunable by a single resistor. The proposed circuit yields a true DID function with ideal CFA devices. Analysis with nonideal devices having parasitic capacitance (Cp) shows extremely low but finite phase error (θe); suitable design θe could be minimized significantly. The design is practically active-insensitive relative to port mismatch errors (ε) of the active element. An allpass phase shifter circuit implementation is derived with slight modification of the differentiator. Satisfactory experimental results had been verified on typical wave processing and phase-selective filter design applications.
Highlights
Differentiator and integrator functional blocks find a variety of applications in signal conditioning, wave processing and shaping, as process controller, phase compensator, and as pre-emphasis unit in radio engineering [1]
The literature shows a number of single-input differentiator circuit design schemes using various types of active building blocks, such as voltage operational amplifier (VOA) [2]-[4], current conveyor [5] and current feedback amplifier (CFA) [6]-[9]
A new grounded capacitor single resistor tunable true dual-input differentiator design using the CFA-844 building block is presented in this work
Summary
Differentiator and integrator functional blocks find a variety of applications in signal conditioning, wave processing and shaping, as process controller, phase compensator, and as pre-emphasis unit in radio engineering [1]. A new grounded capacitor single resistor tunable true dual-input differentiator design using the CFA-844 building block is presented in this work. Other versatile properties [12]-[14] of the device relative to analog signal processing functional design, are improved slew-rate, accuracy and effective bandwidth that is nearly gain-independent. Since such a design is not yet reported, it appears appropriate to propose a true dual-input high-q differentiator circuit design based on the CFA device—leading to the motivation of this research work
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