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...

The main technological issues and circuit design challenges arising in the development and manufacturing of the RF front-end electronics for the next generation (terrestrial or space-born) radio communication and remote sensing systems will be synthetically outlined, with the aim of also pointing out both the specific design tool requirements and a number of related research topics. Actually, t...

The power requirements imposed on the amplifier by piezoelectric actuators is discussed. We consider a two-degree-of-freedom mechanical system driven by a piezoelectric stack for the purpose of analyzing power flow and power dissipation of four amplifiers. Two of the amplifiers are benchtop linear amplifiers. The other two amplifiers are based on switching topologies. The power consumption of a...

Target audience: This work is relevant to those interested in parallel transmit amplifiers. Purpose: Previous work has demonstrated the use of high efficiency switch mode power amplifier (SMPA) topologies for miniature on-coil amplifiers aimed at use in parallel transmit coil arrays. Though such amplifiers demonstrate very high efficiency and power density in isolation, there has not yet been a...

This paper reviews optical fiber amplifiers such as Erbium doped fiber amplifiers EDFAs, many types of Raman amplifiers RAs, Thulium doped fiber amplifiers, Tellurite-based fiber Raman amplifiers, semiconductor optical amplifiers and fiber optic parametric amplifiers, principle of operation and construction. As these amplifiers are used for optical fiber communication projects so we shall go th...

Page Abstract ............................................................................................................2 Introduction ......................................................................................................2 Key MOSFET Electrical Parameters in Class D Audio Amplifiers ....................2 Drain Source Breakdown Voltage BVDSS........................................

Lithium niobate on insulator (LNOI) is an emerging photonic platform with great promise for use in future optical communications, nonlinear optics, and microwave photonics. An important integrated building block, active waveguide amplifiers, however, are still missing the LNOI platform. Here, we report efficient compact amplifier based erbium-doped waveguides, achieved using a sequence of cryst...