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 recent years, nonlinear circuit analysis techniques have been extensively investigated. One of the most important reasons is the application development of solid-state devices at microwave frequencies. Different methods have been used to analysis large signal behavior of these devices. In this paper load-pull curves (one of design requirement) are obtained using Volterra series. The main adv...

Relative intensity noise (RIN) induced penalties were experimentally measured in distributed Raman amplifiers (DRAs) for G.654.E and G.652.D fibres with forward, backward bidirectional pumping configurations. The signal RIN using the fibre was ∼3.5 dB ∼2 lower than forward (FW) pump configuration PM-QPSK PM-8QAM signals, single span transmission showing a Q-factor improvement of ∼3 ∼2.5 over fi...

Two high efficiency Ku-band pHEMT power amplifier MMICs are presented in this paper. A single stage, high efficiency amplifier provides a peak power added efficiency of 57.6% with 10.5 dB associated gain and 26.5 dBm output power into a 50Ω load at 14 GHz. Additionally, a dual stage, high gain amplifier provides a peak power added efficiency of 50.4% with 19.7 dB associated gain and 27.5 dBm ou...

L. W. Nagel, “SPICE2: A computer program to simulate semiconductor circuits,” Univ. of California Berkeley, Engineering Research Laboratory, UBCIERL-M520, 1975. Analog Devices Inc., “SPICE model library release E,” Norwood, MA, 1991. Comlinear Corp., “Simulation macromodels for Cornlinear current feedback amplifiers,” Applicat. Note OA-09, Fort Collins, CO, 1993. L. Smith and D. H. Sheingold, “...

The composite RF signal is amplified and fed to the antenna via a transmitter bandpass filter (Figure 1). The coverage and capacity of the base station define the required amount of output power. Several transistor stages connected in series constitute the gain, and the final stage delivers the output power. High-power amplifiers often have multiple transistors connected in parallel at the outp...

The class-E amplifier [1]-[11] is remarked as the next candidate of digital wireless power transmitters. Non-switching power amplifiers suffer from low power-conversion efficiency due to their inherent power loss in high back off area. Hence, switching power amplifiers such as class-D and E are remarked as a remedy for improving power-conversion efficiency and prolonging battery lifetime of por...

Abstract This article discusses some fundamental properties of electronic amplifiers and the associated implications. When defining passivity a multi-port circuit in sense net power consumption (rather than ability to amplify signals), devices such as transistors, which are commonly described “active”, have be considered passive, is referred “energetically passive” avoid confusion with other de...