Abstract
This paper introduces design of the linearly tunable quadrature voltage-controlled oscillator (VCO) using modern off-the-shelf active elements suitable for the design of electronically adjustable applications. The simplified topology was achieved using non-inertial stabilization of amplitude. It allows targeting adjustability of the oscillation frequency only into lossless integrator part of the topology. This arrangement simplifies the design and the tenability also. Derived symbolical expressions indicate that gain adjustment of used amplifiers (that are still in single path) does not influence amplitude and phase shift ratio of generated waveforms, which is a beneficial feature. The performances of the circuit are tested experimentally in band of units of MHz and results confirmed expected behavior. Initial study of the oscillator with fractional-order capacitors is presented and discussed. Results are supported by laboratory measurements.
Highlights
Professional designers of electronic components and applications utilize various standard elements for their designs
1Abstract—This paper introduces design of the linearly tunable quadrature voltage-controlled oscillator (VCO) using modern off-the-shelf active elements suitable for the design of electronically adjustable applications
It was demonstrated that whole electronic adjustability of the oscillator can be placed into lossless integrator without any effect on generated signals when simultaneous control of their gain is preserved
Summary
Professional designers of electronic components and applications utilize various standard elements for their designs. Omitting the well-known devices, such as operational amplifier, the knowledge and awareness of practicians about many recently introduced active devices [1], [2] are usually limited These devices allow interesting features suitable for circuit synthesis and parametric adjustment in applications in comparison to standard operational amplifiers. Research described in this paper was financed by the Ministry of Education, Youth and Sports under Grant (No LTC18022) of Inter-Cost program and by King Mongkut’s Institute of Technology Ladkrabang (KMITL) under Grant (No KREF026201). These elements are used because of beneficial features of final application as described later. Distortion of output waveforms is expected to be higher [15]
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