Switch-mode technology is the common choice for high-efficiency audio power amplifiers. The dynamic nature of real limits achievable continuous output thus reducing efficiency. Based on methods used radio frequency (RF) amplifiers, this article proposes a tracking multilevel supply (TMLPS) in order to improve system A simple prototype designed and tested up 200 W. Measured results show that emp...

A control circuit for the auxiliary buck/boost converter was designed and implemented to improve load transient response of buck converter. The shapes inductor current in critical conduction mode through peak control. soft-switching operation switches minimizes power loss thus increases efficiency Along with design guidelines estimated performance proposed technique, implementation is explained...

Intrinsic Instability, multistability and hysteresis have been observed in the photoluminescence of bulk glass doped with Yb and Tm impurities at room temperature. Hysteretic switching of laser output also occurs near threshold in channel waveguides in this material. Local field effects are shown to present new, fundamental design limitations for compact optical amplifiers and oscillators. 42.6...

We propose and experimentally demonstrate for the first time a hybrid optical packet and wavelength selective switching platform for high-performance data center networks. This architecture based on cascaded silicon microrings and semiconductor optical amplifiers (SOAs) supports wavelength reconfigurable packet and circuit switching, and is highly scalable, energy efficient and potentially inte...

Class-E amplifiers are a type of switching amplifier offering very high efficiency approaching 100% . In this paper, a topology and design methodology, which could be used for a transmission-line implementation of a class-E power amplifier, is presented. A simple transmission-line class-E load network is proposed that offers combined transformation of the load resistance down to a suitable leve...

In this paper, an adaptive quadrature amplitude modulation (AQAM) scheme for an equalized system over a selective channel is investigated. To reduce intersymbol interference (ISI), a minimum-mean-squarederror decision feedback equalizer (MMSE-DFE) with an unbiased decision rule is used. In order to select the appropriate modulation mode, the receiver estimates the MSE at the equalizer output. T...

In the May 2002 Issue of this Magazine, Late Lester F. Eastman and Umesh K. Mishra made case for what was then a long-shot technology in world power semiconductors: gallium nitride (GaN). They presented an optimistic outlook powerful, rugged radio-frequency amplifiers then-nascent broadband wireless networks radar, as well power-switching applications electric grid. called GaN devices “the toug...