Bilgin Metin

Component reduced all-pass filter with a grounded capacitor and high-impedance input

In the literature, opportunities of the current conveyors with reduced current gains are not adequately emphasised for filter designs. In this study, we show a new all-pass filter (APF) possibility using a current conveyor with half current gain. Although many first-order voltage mode APFs were proposed, most of them either cannot provide high input impedance and grounded capacitor features together or they provide these features with components more than necessary. The presented circuit provides both of these features using reduced number of elements. Spice simulation and experimental results are given to verify the theoretical results.

A novel floating lossy inductance realization topology with NICs using current conveyors

A negative-impedance converter (NIC) is a useful component in the circuit synthesis theory especially for active RC filter design. In this brief, usefulness of the NIC is shown in a floating inductance realization topology that is an alternative application area for the component. A new floating parallel RL realization topology employing two NICs and three passive components is presented

A New All-pass Section for High-Performance Signal Processing with a Single CCII–

This paper presents a new all-pass section (APS) employing a negative-type second-generation current conveyor (CCII-), two resistors and a grounded capacitor, which is important from the integrated circuit (1C) implementation point of view. The use of the grounded capacitor allows the 1C implementation with standard CMOS technologies. This circuit is also suitable for the realization by using current controlled current conveyor (CCCII) as active element. In this case the current-controlled intrinsic x-terminal resistance of the conveyor realizes one resistor and the circuit employs only one external resistor and one grounded capacitor. The proposed circuit is verified with SPICE simulations and experimental results. bersicht Die Arbeit stellt eine neue Allpa -Schaltung (APS) vor, die aus einem Current-Conveyor vom Minus-Typ der zweiten Generation (CCII-) sowie aus zwei Widerst nden und einem einseitig geerdeten Kondensator besteht. Letzteres ist aus Sicht der Implementierung in integrierte Schaltungen (1C) wichtig und erlaubt die Verwendung standardisierter CMOS-Technologien. Die Schaltung kann ebenso mit einem stromgesteuerten Current-Conveyor (CCCII) als aktives Element realisiert werden. Hierbei wird der stromgesteuerte intrinsische Widerstand des x-Ausgangs des Conveyors verwendet, so da neben dem Kondensator nur noch ein Widerstand ben tigt wird. Die vorgeschlagene Schaltung wurde mit dem Programm SPICE simuliert und me technisch gepr ft F r die Dokumentation Allpass / CMOS-Technologie / Current-Conveyor Frequenz 57(2003) 11-12

All-pass filters using DDCC- and MOSFET-based electronic resistor

The main motivation in this paper is to draw attention to the tunability and input-signal amplitude limitations when a nonlinear device is used as a resistor. For this purpose, two first-order all-pass filters are proposed using differential difference current conveyor (DDCC), a capacitor and a resistor without element-matching restriction. These all-pass filter circuits can be made electronically tunable with electronic resistors. Tunability and input-signal amplitude limitations of the proposed circuits due to the operational restrictions of the electronic resistors are examined. PSPICE simulations confirm the validity and the practical utility of the proposed circuits. Copyright

CMOS-controlled inverting CDBA with a new all-pass filter application

In this study, new active elements called inverting current differencing buffered amplifier (ICDBA) and current-controlled ICDBA (C-ICDBA) are presented. Unlike current differencing buffered amplifier (CDBA), their voltage transfer ratio between the Z and W terminals are equal to minus one. Furthermore, CMOS implementations of the C-ICDBA and current-controlled CDBA (C-CDBA) are shown. Moreover, a novel first-order all-pass filter is proposed to show advantages and new circuit producing capability of the ICDBA/C-ICDBA. Lastly, an electronically tunable band-pass filter is given as an application example using the presented all-pass filter. The measured and simulation results are in good agreement with the theoretical ones. Copyright

All-pass filter for rich cascadability options easy IC implementation and tunability

This paper presents two current-mode all-pass sections, employing only grounded components, which is important from the integrated circuit (IC) implementation point of view. The use of the grounded capacitor allows the IC implementation with standard CMOS technologies. The circuits can be made electronically tunable due to grounded resistors that can be realized by using voltage controlled MOS based resistors. In addition, the circuits have both low input impedance and high output impedance for easy cascadability. The stability analysis proves that the circuits are stable. SPICE simulations and experimental results are in close agreement with the theory.

DDCC based all-pass filters using minimum number of passive elements

In this study, three first order all-pass filters are proposed using differential difference current conveyor (DDCC), a capacitor and a resistor without element-matching restriction. The theoretical results are verified with SPICE simulations.

Canonical inductor simulators with grounded capacitors using DCCII

Differential current conveyor (DCCII) can be defined as a second-generation current conveyor with current differencing capability. In this article, a BJT implementation of the DCCII is introduced. Also, to emphasise the advantage of this active element, two new inductance simulator circuits are proposed as application examples. Furthermore, the presented inductor simulator circuits employ a minimum number of elements and they enjoy having grounded capacitors. Experimental and simulation results are given to verify theoretical analyses.

Voltage-mode MOS-only all-pass filter

In this study, a simple voltage-mode first-order all-pass (AP) filter implementation is presented which employs only MOS transistors instead of active elements like CCH, CDBA, FTFN, etc. that include large number of transistors. Transconductance (gm) and gate-to-source parasitic capacitance (Cgs) of the transistors are employed to form the AP transfer function. It is shown that simulations are in good agreement with the theoretical results.

A new high-performance CMOS fully differential second-generation current conveyor with application example of biquad filter realisation

In this article, a new complementary metal oxide semiconductor (CMOS) high-performance fully differential second-generation current conveyor (FDCCII) implementation is proposed. The presented FDCCII provides high-output impedance at terminals Z+ and Z−, good linearity and excellent output–input current gain accuracy. Also, the proposed FDCCII circuit operates at a supply voltage of ±1.3 V. The applications of the FDCCII to realise voltage-mode multifunction filters are given. Simulations are performed using TSMC CMOS 0.35-μm technology to verify theoretical results.