In this paper we look at the load presented to audio amplifiers by real transducers. We consider the power losses in Class-AB and Class-D amplifier topologies, and determine that in order to predict efficiency it is necessary to consider the amplifier/transducer combination. The ability of the class-D amplifier to recycle quadrature load current offers new ways to improve efficiency. INTRODUCTI...

In this paper we look at the load presented to audio amplifiers by real transducers. We consider the power losses in Class-AB and Class-D amplifier topologies, and determine that in order to predict efficiency it is necessary to consider the amplifier/transducer combination. The ability of the class-D amplifier to recycle quadrature load current offers new ways to improve efficiency. INTRODUCTI...

An instrumentation unit that measures heat flow along the test column of solid metal samples is described. The study also describes design a datalogger using Arduino Mega Microcontroller. designed incorporates current and voltage sensing unit, ten thermocouple sensors amplifiers, microSD card shield, two LCDs, four microcontrolled switching relays 12 V DC water pump motor. parameters measured b...

Active magnetic bearings (AMBs) have led to great progress in the field of rotating machinery due their many advantages, such as non-contact and non-lubrication properties. As key component an AMB actuator, switching power amplifier has important impact on performance machinery. In this paper, topologies amplifiers for AMBs are introduced. The traditional half-bridge topology two newly proposed...

Class D amplifiers are typically very efficient, making them ideal candidates for portable applications that require long battery life and low thermal dissipation. However, electromagnetic interference (EMI) is an issue that commonly accompanies the Class D switching topology. Activeemissions limiting reduces radiated emissions and enables "filterless" operation, allowing designers to create sm...

Introduction: High-performance MRI systems demand the use of digitally controlled switching gradient amplifiers (SGAs) that need complex electronic circuits and control algorithms to achieve not only good image quality but also good power efficiency [1-2]. Moreover, the imaging capabilities of clinical MRI system may be improved by the use of gradient insert coils that achieve gradient amplitud...

Bifurcation amplifiers are known for their extremely high sensitivity to weak input signals. We implement a bifurcation amplifier by harnessing the Duffing nonlinearity in parametrically excited MoS2 nano-electromechanical system. utilize ultra-sensitive switching response between two states of detect as well register charge-fluctuation events. demonstrate open-loop real-time detection ultra-lo...

in this paper, we investigate the parameters affecting total harmonic distortion (thd) and power supply rejection ratio (psrr) in pwm class d amplifiers (cdas) on the basis of linear models with feedback. from our mathematical analysis, we show that the thd of a pwm class d amplifier with feedback can be improved by increasing the gain of the integrator through adding another amplifier at the o...