This paper shows how intermodulation distortion, IMD, sweet spots can be used as a practically meaningful technology to design highly linear microwave power amplifiers. It starts by reviewing the physical origins of these points of large signal to nonlinear distortion ratio, distinguishing the ones uniquely determined by the active device’s quiescent point – small-signal IMD sweet spots – from ...

Coherent combining of fiber amplifiers is a promising technique to increase the overall output power from efficient and compact laser sources while simultaneously maintaining beam quality. Active phase controlling of master oscillator power amplifiers (MOPA) is one of the most common coherent beam combining (CBC) architecture [1-3]. Up to now, the highest-power obtained by CBC and CBC of larges...

Monolithic integrated lumped planar transformers were introduced more than ten years ago. We present a comprehensive review of the electrical characteristics which results in an accurate lumped low-order equivalent model. Amplifiers, mixers and Meissner-type voltage controlled oscillators using monolithic transformers have been published a few years ago. For the first time, integrated transform...

After years of development and trial usage, cloud computing has finally entered into mainstream and wide spread commercial use. Among the various cost elements in operating a cloud computing infrastructure, power usage stands out prominently. In fact, how to reduce the power consumption of cloud computing platforms has received considerable attention of the cloud service provider as well as aca...

A qualitative method to verify the presence of parametric oscillations at ${f_{0}}/{2}$ in power amplifiers (PAs) is presented and validated. It relies on simultaneous application fundamental subharmonic tones trigger possible can be implemented any commercial harmonic balance solver without requiring external software that may expensive or however not available designer. Wide applicability gua...

Low-voltage and low-power multistage operational transconductance amplifiers with new and efficient gain boosting and frequency compensation schemes are proposed in this paper. The presented amplifiers are designed to drive large capacitive loads with small power consumption at low-voltage supplies. The compensation schemes exploit a single Miller capacitor and an active feedback to form the ma...

Piecewise behavioral models are commonly adopted for modeling and linearization of RF power amplifiers (PAs) that exhibit strong amplitude-dependent nonlinear distortion characteristics, as global polynomial approximations tend to underperform in such scenarios. In this article, we consider a new piecewise model PAs based on the mixture experts (ME) approach, which builds probabilistic allows d...

In this article, we propose a novel technique of digital predistortion (DPD) for dual-band power amplifiers (PAs) based on the periodically nonuniform sampling (PNS) theory. contrast to conventional DPD (2-D-DPD) models, proposed sampled (PNS-DPD) has only single input, which can largely reduce model complexity. We fold two stimuli with aliasing and feed them simple single-band model. The desir...

This paper deals with wireless multi-radio transmitter architectures operating in the frequency band of 800 MHz – 6 GHz. As a consequence of the constant evolution in the communication systems, mobile transmitters must be able to operate at different frequency bands and modes according to existing standards specifications. The concept of a unique multiradio architecture is an evolution of the m...