Abstract
Energy consumption is always a key feature in devices powered by electric accumulators. The power amplifier is the most energy-demanding module in mobile devices, portable appliances, static transceivers, and even nodes used in underwater acoustic networks. These devices incorporate a modulator, typically a pulse-width modulation (PWM) and a class-D power amplifier, for higher efficiency. We propose a technique to integrate the modulator of a transmitter and PW-modulator of a class-D amplifier to improve the overall efficiency of the system. This integrated set operates as an up-converter, phase modulator (PM), and binary phase-shift keying (BPSK) modulator under certain conditions. The theoretical concept is verified using Matlab and a model is designed and simulated in Simulink. For validation purposes, an electronic circuit is built and tested using Multisim. The results obtained by simulations and circuit implementation show that the proposed integrated system is an energy-efficient and cost-effective solution compared to conventional techniques.
Highlights
With the increasing demand for mobility, more devices incorporating digital wireless communication systems are being operated by electric accumulators, e.g., human surveillance to crops monitoring, and aerial drones to autonomous underwater vehicles (AUVs)
A traditional class-D amplifier consists of an analog modulator of a digital carrier followed by a switch circuit that drives the current from a DC power supply
In many of their applications, class-D amplifiers are used at high fidelity frequencies and the retrieving filter is a low-pass filter (LPF)
Summary
With the increasing demand for mobility, more devices incorporating digital wireless communication systems are being operated by electric accumulators (batteries), e.g., human surveillance to crops monitoring, and aerial drones to autonomous underwater vehicles (AUVs). A traditional class-D amplifier consists of an analog modulator of a digital carrier followed by a switch circuit that drives the current from a DC power supply. This current passes to the load through a filter that retrieves the baseband signal. The power delivered to the load is sensitive to the voltage of the DC source, and the switch has to be able to drive high current In many of their applications, class-D amplifiers are used at high fidelity (hi-fi, 20 Hz–20 kHz) frequencies and the retrieving filter is a low-pass filter (LPF). TheThe firstfirst is pulse values, which can PW-modulationscan canbebeclassified classified according several criteria.
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