The generation of power- and wavelength-scalable few optical cycle pulses remains one the major challenges in modern laser physics. Over past decade, development table-top parametric chirped pulse amplification-based systems was progressing at amazing speed, demonstrating excellent performance characteristics terms duration, energy, peak power repetition rate, which place them front line ultraf...

This paper describes the efficiency-limiting factors resulting from transistor current source in case of class-F and inverse (F-1) operations under saturated region. We investigated influence knee voltage gate-voltage clipping behaviors on drain efficiency as limiting for source. Numerical analysis using a simplified model was carried out. As result, we have demonstrated that factor class-F-1 o...

A power amplifier structure is presented that has a low output variation against the load impedance at 6.78 MHz using two Class E amplifiers and λ/4 transmission line. with another high are connected in parallel phase difference of 90° Each generates same under nominal conditions to achieve maximum efficiency. The can be reduced during operation, which increases from one decreases time when cha...

In this letter, novel class-F and inverse class-F power amplifier (PA) topologies were proposed, simulated, realized and measured for 2.7–2.9GHz frequency band by using Gallium Nitride high electron mobility transistor (GaN HEMT). Realizations are made on Rogers TMM3 dielectric material which has 0.381mm thickness and 3.27 dielectric constant. Proposed class-F and inverse class-F PAs have 10W (...

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...

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...

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...