The authors present a new versatile circuit building block called a differential difference current conveyor (DDCC). An IC technique for implementing the DDCC is also presented. The DDCC-based frequency-selective circuits and nonlinear building blocks such as multiplier, squarer and square rooter are developed. Experimental results are given to demonstrate the feasibility of the proposed techniques, and they show that DDCC-based circuits offer a competitive design choice to CCIIbased and DDA-based circuits.
Aparasitic-capacitance-insensitive MOS-FET-C integrator and differentiator using operational transresistance amplifiers are proposed and experimental results demonstrated. The bandwidths of these circuits are also independent of their gains. The required capacitances are smaller than those in previous work. Two new configurations of universal current-mode biquad filters based on these circuits are presented. A secondorder bandpass filter constructed using universal biquad filters and another third-order Chebyshev lowpass filter with 0.1 dB passband ripple are breadboarded and the measured results presented.
InteeratorIndexing f p r m : Integrurig ormirs, MOSFET circuits, Operationu/ rranscondu runce omplipers A highly linear MOS operational transresistance amplifier (OTRA) integrator with reduced number of capacitors and MOSFET transistors IS proposed. Only one capacitor is required for an integrator to achieve cancellation of MOSFET nonhnearities. The proposed integrator is insensitive to the effects of parasitic capacitances and can be interconnected without adding any buffers. Experimental results are given to verify the theoretical analysis.
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