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Your search keyword '"Joshi, Sridhar"' showing total 15 results
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15 results on '"Joshi, Sridhar"'

2. Nonlinear control-based class-D amplifier for audio intelligent infrastructure applications

Author

Joshi, Sridhar, Priscila, S. Silvia, Rajest, S. Suman, Srivastava, Kriti, Surendhar, S. Prasath Alias, and Rajasekaran, Rajkumar

Abstract

A nonlinear control-based class-D amplifier using a DC power source for medium-power audio applications is proposed in this paper. The amplifier utilises switches in a half-bridge configuration to realise the class-D power stage. A passive second-order bandpass filter is cascaded with the power stage to render a highly linear audio amplifier for high-quality audio reproduction. A nonlinear technique-based controller is used for a closed-loop amplifier system which offers high immunity to power supply noise, robustness, and fault tolerance without using a triangular carrier generator. An 80 W, 20 Hz to 20 kHz amplifier model is developed considering the nonlinearity present in the power electronic switches of the power stage. Simulation results of the proposed amplifier with a full range 4 Ω loudspeaker load are presented. The amplifier's response at different frequencies in the audio spectrum is presented, which confirms the amplifier's linearity and command following property. To confirm the high linearity of the amplifier, the THD versus frequency plot is depicted, which ensures the suitability of the proposed amplifier for high-fidelity audio amplification.

Published
2024
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14. Strategies for Quality CAD PDKs

Author

Gadepally, Kamesh V., primary, Young, Mark, additional, Lin, James, additional, Franklin, Andy, additional, Perumal, Ravi, additional, and Joshi, Sridhar, additional

Published
2008
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15. Design and Development of Non-Linearly Controlled Class-D Audio Amplifier.

Author

Joshi, Sridhar, Tripathi, Ravi, Badoni, Manoj, Kumar, Rajeev, and Khetrapal, Pawan

Subjects
AUDIO amplifiers, AUDIO frequency, PEAK load, FREQUENCY spectra
Abstract

A systematic and simple approach to develop a 20 W audio frequency range switch mode amplifier is presented in this paper. A non-linear sliding mode (SM) technique-based low cost analog controller enables the realized amplifier to deliver highly linear and efficient operation throughout the audio frequency spectrum. The theoretical aspects and practical limitations in the design and realization of subsystems, such as the signal conditioning stage, power stage and sliding mode controller, are considered, while the viable solution is also stated and justified. The hardware realization scheme is also elaborated, based on which the laboratory prototype is fabricated. Hardware results with a 4 Ω resistive load are given on which the performance of the amplifier is evaluated. The total harmonic distortion (THD) below 1% and 73% efficiency at peak load make the amplifier well suited for high quality audio application. [ABSTRACT FROM AUTHOR]

Published
2022
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