A new circuit configuration uses a single operational transresistance amplifier (OTRA) and four passive elements to realize both first-and second-order allpass filters. Owing to internal grounding of the OTRA input terminals, effects of input parasitics are significantly reduced. Applications of the circuit include the realization of the phase equalizer, the quadrature oscillator, and the high-Q bandpass filter for analog signal processing. The performance of the allpass filter is illustrated by circuit-level simulation of a quadrature oscillator with CMOS realization of the OTRA.

In this paper, realization of series and parallel R-L immitances using differential voltage current conveyor (DVCC) is presented. The proposed circuits enable actively simulation series and parallel R-L and (-R)-(-L) immitances. Applying RC:CR transformation to the proposed configurations, series and parallel C-D and (-C)-(-D) simulators can also be realized with the same topology. They employ single DVCC and at most three resistors and one capacitor. No component matching constraints are imposed for the realisations. The performance of the proposed immittance simulators is demonstrated on both a second-order voltage and second-order current-mode filters. PSPICE simulations are given to verify the theoretical analysis.

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A grounded negative inductance emulator is proposed with full independent control on both the inductance value and the condition. It uses a single operational transresistance amplifier (OTRA), a capacitor, and five resistors, two of which are for independent control. Experimental results, which confirm the theoretical analysis, are presented.