Yasuaki Sumi

Versatile current-mode biquadratic circuit using only plus type CCCIIs and grounded capacitors

This paper introduces a versatile current-mode biquadratic circuit using second generation current-controlled current conveyors (CCCIIs). The circuit is constructed with two plus type multiple current output CCCIIs (MO-CCCIIs) and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by choosing appropriate input and output terminals without any component matching conditions. Additionally, the circuit parameters Q and ω0 can be set orthogonally by adjusting the bias currents of the MO-CCCIIs and grounded capacitors. The biquadratic circuit enjoys very low sensitivities to the circuit components. Some examples are given together with simulated results by PSPICE.

Novel current-mode biquadratic circuit using only plus type DO-DVCCs and grounded passive components

This paper introduces a novel current-mode biquadratic circuit using plus type differential voltage current conveyors (DVCCs) and grounded passive components. The circuit is constructed with two plus type dual current output DVCCs (DO-DVCCs), two grounded capacitors and two resistors. The circuit can realize multiple circuit transfer functions by choosing the appropriate input and output terminals. Additionally, the circuit parameters Q and ω 0 can be set orthogonally by adjusting the passive components. The biquadratic circuit enjoys very low sensitivities to the circuit components. An example is given together with simulated results by PSPICE.

Versatile active-only biquad circuits with loss-less and lossy integrators

This paper presents a realization of voltage-mode and current-mode active-only biquad circuits with a two-integrator loop-structure. The circuits are constructed solely with operational amplifiers (OAs) and operational transconductance amplifiers (OTAs). The biquad circuits can realize the multiple circuit transfer functions, and the circuit parameters can be tuned orthogonally through adjusting the transconductance gains of the OTAs. Also, these biquad circuits enjoy very low sensitivities with respect to the circuit active elements. Some examples are given together with simulated results by PSPICE. The circuit configurations are very suitable for implementation on both bipolar and CMOS technologies.

Electronically tunable first-order all-pass circuit employing DVCC and OTA

This article presents a realisation of an electronically tunable first-order all-pass circuit employing a differential voltage current conveyor (DVCC), an operational trans-conductance amplifier (OTA) and two MOS conductance. The circuit can realise two all-pass characteristics by choosing the current output of the OTA. Additionally, the circuit parameters ω0 and H can be set independently by tuning the circuit active components electronically. Sensitivity analysis shows that the circuit enjoys very low sensitivity to the circuit components. An example is given together with simulated results by PSPICE.

Electronically Tunable Current-Mode Universal Filter Employing CCCIIs and Grounded Capacitors

This paper introduces an electronically tunable current-mode universal biquadratic filter using second generation current controlled conveyors (CCCIIs). The filter circuit is constructed with a CCCII, three dual current output CCCIIs (DO-CCCIIs) and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by choosing appropriate current output branches without any component matching conditions. Additionally, the circuit parameters can be tuned orthogonally by adjusting the bias currents of the CCCIIs. The biquadratic filter enjoys very low sensitivities with respect to the circuit active and passive components. Some examples are given together with simulated results by PSPICE

Novel current-mode biquad filter using OTAs and DO-CCII

This paper presents a realization of a current-mode biquad filter using operational transconductance amplifiers (OTAs) and a dual current output second generation current conveyor (DO-CCII). The proposed filter is constructed with two multiple current output OTAs (MO-OTAs), one OTA, one DO-CCII and two grounded capacitors. The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by choosing appropriate current outputs without any matching conditions of the circuit elements. And the characteristic parameters ω0 and Q can be tuned orthogonally through adjusting the bias currents of the OTAs. The biquad filter enjoys very low sensitivities with respect to the circuit elements. An example is given together with simulated results by PSPICE. The filter circuit configuration is well suited for implementation in both bipolar and CMOS technologies.

Novel current-mode biquad using MO-CCCIIS and grounded capacitors

This paper presents a realization of novel current-mode biquad using second generation current controlled conveyors (CCCIIs). The circuit is constructed with 3 multiple current output CCCIIs (MO-CCCIIs) and 2 grounded capacitors. The biquad can realize low-pass, band-pass, high-pass, band-stop and all-pass characteristics by suitably choosing the current output branches. The characteristic parameters can also be set orthogonally through adjusting the bias currents of the MO-CCCIIs and the grounded capacitors. The biquad enjoys very low sensitivities with respect to the circuit elements. An example is given together with simulated results by PSPICE.

A Study on Contour Line and Internal Area Extraction Method by using the Self-Organization Map

Recently, intelligent transport system (ITS) is actively developed. There are big development areas in it. Within those areas, the research on detection and recognition of the road sign is one of the most important development areas. In this paper, we show the process improvement in order to extract the contour line and recognize the road sign shape from it. We have proposed the new extraction method of the contour line and internal areas from the road sign instantaneously by using the self organization map (SOM)

Novel current-mode biquadratic circuit using only plus type DO-DVCCCs

This paper introduces a novel current-mode biquadratic circuit using only plus type differential voltage current-controlled current conveyors (DVCCCs) and grounded capacitors. The biquadratic circuit is constructed with two plus type dual current output DVCCCs (DO-DVCCCs) and two grounded capacitors. The circuit can realize biquadratic circuit transfer functions by choosing the appropriate input and output terminals. Additionally, the circuit parameters Q and ω0 can be set orthogonally by adjusting the bias currents and capacitors. The biquadratic circuit enjoys very low sensitivity to the circuit components. An example is given together with simulated results by PSPICE.

Novel current-mode active-only biquad with loss-less and lossy integrators

This paper presents a realization of a current-mode active-only biquad with a two-integrator loop structure. The proposed circuit is constructed solely with operational amplifiers (OAs) and operational transconductance amplifiers (OTAs). The circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions, and the circuit characteristics can be electronically tuned by adjusting the transconductance gains of the OTAs. An example is given together with simulated results by PSPICE. The circuit configuration is very suitable for implementation in both bipolar and CMOS technologies.