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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