Two New Third-Order Quadrature Sinusoidal Oscillators

ABSTRACT

This communication presents a systematic realization of two new third-order quadrature sinusoidal oscillators employing operational transconductance amplifiers (OTAs). These oscillators use canonical number of transconductors (four) and canonical number of grounded capacitors (three). The proposed oscillators enjoy independent electronic control of the condition of oscillation (CO) and frequency of oscillation (FO). The independent electronic adjustment of FO through two identical transconductances controlled by a single external voltage (without disturbing CO) is beneficial in designing voltage-controlled oscillators (VCOs). The presented oscillators have high-frequency stability factor and low power consumption. Circuit simulations employing CMOS OTAs and experimental results using off-the-shelf available OTA IC LM13700 have also been included to confirm the workability of the presented circuits.

KEYWORDS:

• Operational transconductance amplifier
• Quadrature oscillators
• Third-order oscillators
• Voltage mode

Acknowledgements

The authors wish to thank the anonymous reviewers for their constructive comments and suggestions in improving the quality of the manuscript. (This work has been performed at Analog Signal Processing Laboratory of Electrical Engineering Department, Delhi Technological University, New Delhi- 110042, India.).

Additional information

Notes on contributors

Ajishek Raj

Ajishek Raj received BTech degree in electrical and electronics engineering from Dr M G R Educational and Research Institute, Chennai, India in 2012, MTech degree from Delhi Technological University, Delhi, India in 2016. Currently, he is pursuing for doctoral studies in the Department of Electrical Engineering at Delhi Technological University, Delhi, India. His research interests are in the area of analog signal processing, signal generation, active non-linear applications, and inverse analog filters.

Data Ram Bhaskar

D R Bhaskar received BSc degree from Agra University, BTech degree from Indian Institute of Technology (IIT) Kanpur, MTech from IIT Delhi, India and PhD from University of Delhi, India. Prof Bhaskar held the positions of lecturer (1984–1990) and senior lecturer (1990–1995) at the Electrical Engineering Department of Delhi College of Engineering (now Delhi Technological University). He joined the Electronics and Communication Engineering (ECE) Department of Jamia Millia Islamia, New Delhi, India in July1995, as a reader and became a professor in January 2002. He served as the head of the Department of ECE from 2002 to 2005. Presently, he is working in the Department of Electronics and Communication Engineering, Delhi Technological University, Delhi, India. His teaching and research interests are in the areas of bipolar and CMOS analog integrated circuits and systems, current mode signal processing, communication systems and electronic instrumentation. Prof Bhaskar has authored or co-authored 98 research papers—all in international journals of repute. He has co-authored 4 monographs. He has acted/has been acting as a reviewer for several journals of IEEE, IEE and other international journals of repute. Email: [email protected]

Pragati Kumar

Pragati Kumar professor in Department of Electrical Engineering, Delhi Technological University, New Delhi, India was born in Muzaffarpur, India. He received his PhD from The University of Delhi, Delhi, India in 2008. His teaching and research interests are in the area of network analysis and synthesis, microelectronics, CMOS analog integrated circuits and fractional order circuits/systems. He authored/co-authored 30 research papers in various international journal/conferences/edited book volumes. Email: [email protected]