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Article

Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency

1
Department of Radio Electronics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3082/12, Brno 616 00, Czech Republic
2
Department of Telecommunications, Faculty of Electrical Engineering and Communication, Brno University of Technology, Technicka 3082/12, Brno 616 00, Czech Republic
*
Author to whom correspondence should be addressed.
Electronics 2018, 7(9), 157; https://doi.org/10.3390/electronics7090157
Received: 29 June 2018 / Revised: 6 August 2018 / Accepted: 16 August 2018 / Published: 22 August 2018
This paper shows the topology design of a simple second-order oscillator based on two three-port current conveyors, two resistors, and two grounded capacitors, as well as its modification to a voltage-controlled oscillator (VCO). In comparison with many previous works, the following useful conceptual novelties and improvements were made in this study. Both resistors presented in the topology can be employed to tune of the oscillation frequency by the simultaneous driving of two optocouplers with resistive output stage. The current gain of the current conveyor ensures the control of the oscillation condition. The proposed solution offers advantages (in comparison with many standard so-called single-resistance-controllable types) of improved dependence of the frequency of oscillation (FO) on a driving force (extended tuning of the FO), constant ratio of amplitudes of generated waveforms when the FO is tuned, low complexity (taking into account auxiliary circuitry for optocouplers), and comfortable tuning of the FO by a single control voltage. The oscillator produces waveforms with tunable frequency having a constant 45-degree phase shift between them. The relative sensitivities of the proposed solution achieve typical values for these second-order systems (−0.5). Experimental verification confirmed the expected behavior in the operational band between 1 and 10 MHz tuned by a DC voltage from 1.7 to 5 V. This indicates a significant reduction of the driving force ratio (3:1 in our case) in comparison with standard tuning approaches required for a ratio of 10:1 for FO adjustment. Output amplitudes reached 100 and 150 mV in the observed tunability range with distortion ranging between 0.7 and 3.3%. View Full-Text
Keywords: current conveyors; frequency control; optocoupler; oscillator; single-resistance-controlled oscillator; SRCO; tuning; VCO current conveyors; frequency control; optocoupler; oscillator; single-resistance-controlled oscillator; SRCO; tuning; VCO
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MDPI and ACS Style

Sotner, R.; Jerabek, J.; Langhammer, L.; Dvorak, J. Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency. Electronics 2018, 7, 157. https://doi.org/10.3390/electronics7090157

AMA Style

Sotner R, Jerabek J, Langhammer L, Dvorak J. Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency. Electronics. 2018; 7(9):157. https://doi.org/10.3390/electronics7090157

Chicago/Turabian Style

Sotner, Roman, Jan Jerabek, Lukas Langhammer, and Jan Dvorak. 2018. "Design and Analysis of CCII-Based Oscillator with Amplitude Stabilization Employing Optocouplers for Linear Voltage Control of the Output Frequency" Electronics 7, no. 9: 157. https://doi.org/10.3390/electronics7090157

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