Dual-Mode Controlled Pulse Width Monostable Multivibrator Using DVCCs

Abstract

This paper proposes a dual-mode controlled pulse width monostable multivibrator used for analogue signal processing applications that employs two di®erential voltage current conveyors (DVCCs), four passive components and an analogue switch. Unlike the traditional operational-ampli¯er-based monostable multivibrators, the proposed circuit contributes a dual-mode controlled scheme for adjusting the output pulse width through a voltage source and a grounded resistor. This paper discusses several previous designs and presents the circuit operations, related governing formulas, non-ideal e®ect problems, design considerations, and experimental examples of the proposed circuit. A prototype circuit was implemented, and commercially integrated circuits and discrete passive components were used to execute the experimental tests. The features of the proposed circuit are discussed, and the experimental results indicated that the circuit is feasibly used in dual-mode controlled pulse width for the output pulse and were consistent with those of the theoretical analyses.

A CCII‐based non‐inverting Schmitt trigger and its application as astable multivibrator for capacitive sensor interfacing

“…In this sense, oscillators are typically employed as capacitive sensor interfaces because when a capacitance variation occurs, the circuit can be set in order to show linear and wide output waveform period variations. Furthermore, they can still be employed as resistive sensor interfaces even if, in some cases, the output waveform period is not linearly proportional to the sensing element (typically due to the presence of a logarithmic term) .…”

“…Oscillators are typically based on voltage comparators and positive feedbacks. In the literature, several solutions about CM Schmitt trigger circuits, working as analogue comparators, have been proposed , mainly employing custom solutions that are particularly aimed to use a reduced number of components, to be employed in LV and LP applications and to develop novel techniques towards the threshold setting capability.…”