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...

Wide band code division multiple access (WCDMA) signals, transmitted by the base station high power amplifiers (HPAs), show high peak to average power ratios (PAPR), which results in nonlinear distortions. In this paper, using computer simulations effect of using a predistorted HPA on the symbol error rate (SER) of multi-user detectors in terms of output back-off (OBO) in the transmit power...

The maximum output voltage of the audio amplifier is limited to magnitude power supply transistor or operational on final amplifier. This limits output. way enlarge without increasing bridge method bridged modes. With this a will be generated. Bridge Amplifier also known as Bridge-Tied Load (BTL) Bridged Transformerless. principle Amplifiers use pair amplifiers whose outputs have opposite phase...

We describe our progress on the development of extended interaction klystron amplifiers operating at 670 GHz, meeting demanding requirements for output power, gain, bandwidth, and efficiency.

This paper presents a novel stereo enhancement structure for the surround stereo class-D audio amplifier. The principle of this stereo enhancement scheme has been analyzed. It shows that the amplifier with this proposed circuit have a better live effect than the traditional class-D audio amplifiers. In this circuit, the input audio signal from one channel can be amplified in the two channels at...

Class-D audio amplifiers are particularly efficient, and this efficiency has led to their ubiquity in a wide range of modern electronic appliances. Their output takes the form of a high-frequency square wave whose duty cycle (ratio of on-time to off-time) is modulated at low frequency according to the audio signal. A mathematical model is developed here for a second-order class-D amplifier desi...

THE BALANCED CURRENT AMPLIFIER A NEW PARADIGM FOR THE 21ST CENTURY In 1931 Loy Barton, a research worker employed by David Sarnoff , unearthed the paradigm that has dominated all electronic power amplifiers used for audio reproduction and industrial power to this present day. Many incremental additions have embellished Loy’s original invention since its inception. The embellishments have many n...

In modern CMOS technologies reliability issues limit the maximum operating voltage of transistors. This prevents the integration of efficient power amplifiers (e.g., audio or RF) since stacked devices are needed to prevent breakdown, which reduces efficiency. Transistor reliability is strongly related to operating voltages; higher voltages result in faster degradation and hence in lower reliabi...