Author(s)

Koushick Mathur¹, Palaniandavar Venkateswaran², Rabindranath Nandi^2*

¹Department of Electronics & Communication Engineering, UIT, University of Burdwan, Bardhaman, India.
²Department of Electronics & Telecommunication Engineering, Jadavpur University, Kolkata, India.

A new current feedback amplifier (CFA) based dual-input differentiator (DID) design with grounded capacitor is presented; its time constant (τ_o) 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 (C_p) shows extremely low but finite phase error (θ_e); suitable design θ_e 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.

CFA, Tunable Differentiator, Dual-Input Differentiator, Wave Shaper

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.