This work presents a comprehensive theoretical analysis of current-mode power amplifiers as function input for different biasing classes under the common simplifying assumption constant transconductance and hard current cut-off/saturation. Typically, amplifier performance behavior are carried out only at maximum output power. However, to achieve high data-rates, modern telecommunication systems...

In this paper, we report on the design and evolution of a 500W, 27 MHz Class E amplifier. It doubles the operating frequency of previous high efficiency amplifiers using MOSFET transistors in the TO-247 package. Device criteria, circuit design, and amplifier performance characteristics are presented and compared to a HEPA computer model.

In this study, balanced and single ended class-E power amplifiers (PAs) were designed and realized for 3.5–3.8GHz band by using Gallium Nitride high electron mobility transistor (GaN HEMT). Realizations were made on low loss Rogers RT5880 dielectric material which has 0.254mm thickness and 2.2 dielectric constant. Proposed balanced class-E PA has approximately 20W (43 dBm) output power with 80%...

In this contribution, an inverse-class-F (F -1 ) power amplifier at 1.7 GHz using GaN device is proposed and experimentally tested. The novelty in the design is the use of a three-layers rectangular slot resonators in microstrip line’s ground plane as harmonic filter. In particular, a planar periodic structure composed by two different slot resonators is used to control 2 nd , 3 rd harmonics an...

—In this paper, analysis and synthesis approach for two new variants within the Class-EF power amplifier (PA) family is elaborated. These amplifiers are classified here as Class-amplifier topologies developed in this paper simultaneously satisfy the Class-EF optimum impedance requirements at fundamental frequency, second, and third harmonics as well as simultaneously providing matching to the c...

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...

Advisor: l\[ichacl Hoffman The continual push for smaller size and decreased power consumption has prompted the adoption of class D amplification for speaker and headphone drivers in portable media devices. \Vith proper design, the power efficiency of this amplifier type can exceed any other topology over the whole output range, even at low output levels. Simple amplifier topologies arc not the...

any defects in street trees may cause injuries to human, vehicles and buildings. this research was investigated in the babol city, mazandaran province, in the northern state of iran.used the perfect inventory methods and measured the diameter at breathe height (dbh), height and hazardous criteria (dead woods, cracks or seams, decay, wound or cankers, root problems, weak branch unions and skew f...