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This paper presents the needed interface geometry from device characterization process that is required for a comprehensive set of load-pull data. It also shows the method to obtain this geometry when the dielectric material used for characterizing the active device is different from the one used for the amplifier. The basics of load-pull method for device characterization are used to make the case...
In order to get high output power to load, a methodology called load-pull and source-pull is often utilized to select the optimal input and output impedance. Based on the methodology, using the GaN HEMT CGHV1F006S from CREE, simulation is performed by using microwave simulation software ADS. The results indicate that within 8.5GHz–10.2GHz, Delivered Power is higher than 37 dBm with Gain Ripple being...
A high-efficiency power amplifier (PA) is important in a Megahertz wireless power transfer (WPT) system. It is attractive to apply the Class-E PA for its simple structure and high efficiency. However, the conventional design for Class-E PA can only ensure a high efficiency for a fixed load. It is necessary to develop a high-efficiency Class-E PA for a wide-range load in WPT systems. A novel design...
A new visualization tool for design is introduced: the Power Smith Tube. It provides aid in designing for optimum power-added efficiency (PAE) while meeting adjacent-channel power ratio (ACPR) requirements. The Power Smith Tube is a three-dimensional cylindrical extension of the Smith Chart with input power as the vertical axis. As such, this Smith Tube allows the visualization of design metrics,...
In this paper, we present the challenges of modeling and characterization of power devices for use in the design of power amplifiers (PA) intended for use in envelope tracking (ET) applications. We will demonstrate our approach to obtaining the necessary design data from a 2x100 um GaN device. Characterization of power transistors generally occurs at a small range of drain voltage biases whereas in...
A simulation based design procedure for supply modulated amplifiers is presented. With the developed design-guide optimum transistor operation under supply modulation can be simulated with arbitrary modulation voltage functions at varying impedance conditions. Alternative supply voltage functions have been investigated for fixed impedance conditions and for an implemented class-F design.
The use of active load-pull techniques in the design of high efficiency microwave amplifiers has been well documented. This paper describes how it has been applied to the design of a wideband RFIC gain stage. The technique is particularly relevant in new and developing processes where accurate device models are not available and designers otherwise are often forced to use multiple iterations of a...
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