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This contribution present way how to improve the finite attenuation in the stop band in the case of particular transfer function of the specific filtering structure. It is an important problem in the field of active filters. Real non-ideal model (including small-signal parasitic influences caused by real active elements) of the electronically reconfigurable reconnection-less filter is studied in configuration...
This paper presents simple electronically reconfigurable and reconnection-less filtering applications based on useful modification of current differencing unit (CDU). Modified CDU improves its controllable features and bring some other advantages. Three examples of first-order filtering structure in voltage- and current-mode were studied and compared. The last presented solution providing all-pass,...
This contribution deals with special second-order (biquadratic) single-input and single-output filtering structures employing operational transconductance amplifiers (OTAs) for various electronic variation of parameters that leads to reconnection-less transfer response and is tunable. Structures allows change of transfer type between several types of responses (all or some of them) particularly high-pass,...
This contribution deals with special first-order filtering structure design based on two operational transconductance amplifiers (OTAs) and single electronically controllable current conveyor of second generation (ECCII). Controllable parameters of OTAs and ECCII allow electronic reconnection-less reconfiguration among several types of transfer functions. Theoretical assumptions are supported by PSpice...
The main aim of this paper is to show logical method how to obtain fully electronically adjustable active filter with electronic control of type of the transfer function without any change of topology and change of input excitation or reconnection of output. It is important for on-chip applications especially. Results of synthesis are demonstrated on biquadratic filter (band-reject and all-pass response)...
Our contribution deals with combination of controllable current and voltage gain in frame of active element called controlled gain current and differential voltage amplifier (CG-CDVA). Proposed behavioral model was used for construction of very simple and electronically controllable triangle and square wave generator. Simulation results supported theoretical presumptions and confirmed workability.
A novel square wave generator (relaxation oscillator) with controllable frequency is described. It employs two universal current conveyors (UCC) and grounded passive elements. The generator includes integrator with two integration capacitors that alternate in charging which results in linear and precise control of frequency by voltage. New implementation of UCC with attractive properties in CMOS 0...
This paper describes a precision full-wave rectifier of minimal configuration that is able to process both low voltage and low current signals. The behavior of the proposed rectifier is compared with the opamp based circuit by evaluating their DC value transfers and RMS errors. Furthermore, experimental measurements were performed that shown the feasibility of the new circuit to process signal up...
The paper presents new realizations of quadrature sinusoidal oscillators suitable to be used in voltage-mode or current-mode applications. An active device independent topology is proposed and which can be practically implemented using commercially available active elements. Two circuits are exemplified: (i) voltage-mode quadrature oscillator using two current feedback operational amplifier (CFOA),...
A novel fully-differential (F-D) digitally adjustable current amplifier referred to as Digitally Adjustable Current Amplifier (DACA) and its application to the design of F-D filter working in the current mode are presented in this contribution. The basic features of DACA are shown. The filter was designed by the transformation of the single-ended (S-E) structure and is universal. The parameters of...
This paper deals with the modified current-feedback operational amplifier (MCFOA) that is used in two voltage-mode (VM) frequency filters. Both structures presented employ single active and five passive elements. Circuits enable realizing a low- (LP), band- (BP), and high-pass (HP) filter responses without changing the circuit topology. There is no requirement for additional component or rotation...
This paper describes the design of a multifunction biquad filter that can provide multiple transfer functions according to the input and output current ports selected. The filter design is based on a general circuit with five passive elements (three of them are grounded) and one fully differential current follower. This versatile building block is ready to be manufactured by the ON Semiconductor Company...
This paper deals with the application possibility of the digitally programmable current follower in analogue signal processing. In connection with conventional double- and multiple-output current followers a current-mode low-pass filter is proposed. Using digitally programmable current followers the natural frequency of the proposed filter can be electronically adjusted. The advantage of the proposed...
A new general configuration for realization of trans-admittance-and voltage-mode first-order all-pass filters based on differential-input buffered and transconductance amplifier (DBTA) is presented. The proposed generalized configuration is composed of single DBTA and four passive elements, however, the presented four different cases of all-pass filters, derived from the presented general circuit,...
In this paper we present a new universal current-mode frequency filter using only three dual-output second-generation current conveyors (DO-CCII) and five grounded passive elements. Simultaneously a low-pass, high-pass and band-pass can be realized - all with high output impedance. Using the proposed structure the quality factor Q can be via single passive element changed independently of the natural...
A voltage-mode Kerwin-Huelsman-Newcomb (KHN) filter using DVCCs is presented. The filter has high input impedance and employs four active elements, two grounded capacitors and five grounded resistors. Based on the generalized description of the proposed structure various solutions are presented and compared. Spice simulation results are included to verify and demonstrate the feasibility of the KHN...
In this paper new voltage- and current-mode universal frequency filter topologies employing single modified current-feedback operational amplifier (MCFOA) as active element and five passive elements are presented. The proposed filter structures enable realizing all standard filter functions (low-, band-, high-pass, band-stop, and all-pass filter responses). Moreover, the independent adjustment of...
In the paper a novel current-mode multifunction filter is presented, where changing the characteristic frequency f0 and the quality factor Q0 independently of each other and of other parameters is allowed. The whole design procedure is shown, with the Generalized Current Conveyor (GCC) being used in the initial design and the resultant multifunction filter containing the universal current conveyor...
This article deals with OTA-C frequency filter design using the Mason-Coates signal-flow graphs. The procedure of universal circuit design that can realize low-pass, high-pass, band-pass, band-rejection and all-pass frequency filters working in the current mode as well in the voltage mode is shown. The cut-off frequency and quality factor of the frequency filters can be controlled independently. Controlling...
The paper describes a field of filters for high-speed analog signal processing, whose transfer function is affected by the existence of real input impedances of current active elements. The influence of this input impedance is analyzed in detail. This is indicated by both the additive error and the multiplicative error. Novel filter circuits, which partially eliminate the influence of this input impedance,...
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