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A Single Resistor Tunable Grounded Capacitor Dual-Input Differentiator

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DOI: 10.4236/cs.2015.63005    2,218 Downloads   2,565 Views  


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.

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The authors declare no conflicts of interest.

Cite this paper

Mathur, K. , Venkateswaran, P. and Nandi, R. (2015) A Single Resistor Tunable Grounded Capacitor Dual-Input Differentiator. Circuits and Systems, 6, 49-54. doi: 10.4236/cs.2015.63005.


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