17 research outputs found
A simple current-mode Schmitt trigger employing only single MO-CTTA
Abstract- A new current-mode Schmitt trigger based on MO-CTTA (Multiple output current through transconductance amplifier) is presented in this article. The circuit description is very simple, its construction consists of only single MO-CTTA. The hysteresis and amplitude of the output current can be tuned independently/electronically. With mentioned features, it is very suitable to realize in a monolithic chip. The PSPICE simulation and experimental results are depicted, and agree well with the theoretical anticipation. The maximum power consumption is approximately 249mW at Âą5V supply voltages. I
āļ§āļāļāļĢāļāļ§āļĩāļāđāļēāļāļ§āļēāļĄāļāļļāđāļāļāđāļēāđāļāļāļĨāļāļāļĢāļēāļ§āļāļāđāđāļāļĒāđāļāđāļ§āļāļāļĢāļŠāļēāļĒāļāļēāļāļāļĢāļ°āđāļŠāļĢāļļāđāļāļāļĩāđ 2
This research proposes the design and production of a grounded capacitance multiplier, that comprises of resistors and a capacitor. The results obtained depend on the gain of the circuit which is controlled by the resistors, in which the grounded capacitance multiplier that is presented produces the standard value according to theory. The results from simulation by PSpice is correlated with actual evaluation that has standard deviation of Âą5
Realization of electronically tunable voltage-mode/current-mode quadrature sinusoidal oscillator using ZC-CG-CDBA
a b s t r a c t This paper presents a first of its kind canonic realization of active RC (ARC) sinusoidal oscillator with non-interactive/independent tuning laws, which simultaneously provides buffered quadrature voltage outputs and explicit quadrature current outputs. The proposed circuit is created using a new active building block, namely the Z-copy controlled-gain current differencing buffered amplifier (ZC-CG-CDBA). The circuit uses three resistors and two grounded capacitors, and provides independent/non-interactive control of the condition of oscillation (CO) and the frequency of oscillation (FO) by means of different resistors. Other advantageous features of the circuit are the inherent electronic tunability of the FO via controlling current gains of the active elements and the suitability to be employed as a low-frequency oscillator. A non-ideal analysis of the circuit is carried out and experimental results verifying the workability of the proposed circuit are included
āļāļēāļĢāđāļāļĒāđāļāļĢāđāļāļĨāļāļēāļāļāļēāļāļ§āļīāļāļēāļāļēāļĢāđāļāļ§āļēāļĢāļŠāļēāļĢāļ§āļīāļāļēāļāļēāļĢāļāļĢāļ°āļāļāļĄāđāļāļĨāđāļēāļāļĢāļ°āļāļāļĢāđāļŦāļāļ·āļ: āļāđāļāļĄāļđāļĨāļāļ·āđāļāļāļēāļāđāļĨāļ°āļāđāļāļāļ§āļĢāļāļģāļāļķāļA Publication in Journal of King Mongkutâs University of Technology North Bangkok: Basic Information and Consideration
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A Transconductance-Mode Multifunction Filter with High Input and High Output Impedance Nodes Using Voltage Differencing Current Conveyors (VDCCs)
The design of transconductance-mode multifunction biquad filter containing three input voltage nodes and single-output current node is proposed. Its circuit principle is emphasized on employing Voltage Differencing Current Conveyor (VDCC) to be an active building block. The proposed filter description uses three VDCCs co-working with two grounded capacitors and three grounded resistors. The synthesis of the proposed multifunction filter is based on avoidance of using multiple-output active elements to achieve commercially available integrated circuits for practical implementation. Additionally, without multiple-output active element, it can alleviate current tracking error
from the current mirrors used in output ports. It also decreases the amounts of the transistors inside the active elements. The proposed multifunction filter offers all 5 filter functions, which are non-inverting Low-Pass (LP), non-inverting High-Pass (HP), non-inverting
Band-Pass (BP), non-inverting Band-Reject (BR) and also non-inverting All-Pass (AP) functions from same circuit topology under different circuit condition for input signals. Furthermore, the natural frequency for all filtering responses is independently achieved from
the bandwidth or the quality factor of the proposed filter. For cascade-able connectivity, the output current port indeed provides a high impedance. In addition, the magnitude of the output current for all filtering functions can be resistively adjusted. The consideration for
non-ideal case of the presented multifunction filter is also analyzed. The simulation and experimental results of the presented transconductance multifunction biquad filter based on VDCC practically implemented by the commercially available ICs, LM13700 and AD844 can validate the theoretical anticipation.Ostrav