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Baseband injection is a technique that can provide a cost-effective linearizing solution that can be combined with supply modulation techniques such as envelope tracking (ET), to minimize AM/AM distortion and potentially simplify the DSP linearization requirement and associated cost. Recently [8], a new approach for computing the baseband injection stimulus, formulated in the envelope domain, was...
This paper introduces the first formulation and approach that enables measurement based non-linear behavioral look-up table transistor models to be frequency scalable. The experimental results on a M/A-COM GaN HFET from 2 GHz to 8 GHz, support theoretical analysis that frequency domain behavioral models defined in the admittance domain have frequency scalable model coefficients. Load-pull results...
This paper presents a case study of performance comparison between a passive load pull system that uses a vector network analyzer (VNA) as its receiver, and an active load pull system that uses a sampling oscilloscope. The objective of the comparison was to enable parallel research activities between two sites. The two systems are independently used to measure the same device under test, a packaged...
An RF waveform stress test has been developed in order to assess device degradation caused by the infinite VSWR conditions that could result from the removal of a protection isolator. The proposed stress test involves both DC and RF characterization of a device, before and after an RF stressing mechanism is applied. The procedure was first applied with the device being stressed whilst driving into...
Load and source pull measurement data has for some time now been a critical and integral part of the power amplifier design process, offering accurate performance data of the actual device that is to be used. This data can be used directly to generate graphical representations of key parameters such as output power, efficiency and gain as functions of source and load impedance, for model verification...
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