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Automation of Bandwidth Re-design and its Applications in Amplifier Tuned Oscillators Based on Nullors

R. Rohith Krishnan

https://orcid.org/0000-0002-4792-5946

Department of Electronics, Sree Ayyappa College, Eramallikkara, Chengannur, Kerala 689109, India

E-mail Address: rohithpunnoor@gmail.com

Corresponding author.

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and

S. Krishnakumar

Department of Electronics, School of Technology and Applied Sciences, Mahatma Gandhi University Research Centre, Edappally, Kochi 24, Kerala, India

E-mail Address: drkrishsan@gmail.com

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https://doi.org/10.1142/S0218126621500547Cited by:0 (Source: Crossref)

Abstract

In this paper, the method for the design automation of a narrow band-pass amplifier, and hence the amplifier tuned oscillator is discussed. A fixator approach is utilized in this method to design the narrow band-pass amplifiers and a reference circuit is required for this process. The fixator–norator pair helps to generate an extra sub-circuit, generally the feedback network; the addition of this sub-circuit in the actual amplifier circuit will modify the frequency response of the amplifier. The amplifier now behaves like an active narrow band-pass filter, which exactly follows the frequency response of the model circuit. This can be turned into an oscillator by providing positive feedback. Such a circuit possesses independent frequency and amplitude control. Hence, the re-designed circuit can be employed as an active filter or an oscillator at the selected center frequency. In addition to the technical merits, the proposed method has pedagogical importance. Few case studies are worked out in this paper to demonstrate the method.

This paper was recommended by Regional Editor Emre Salman.

Keywords:

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