Active load pull solutions
18 June 2010
Mesuro has released frequency extensions to its MB series of active load pull solutions.
Additionally, the company shared the results of its work with industry leaders to design harmonically tuned, near theoretically-efficient power amplifiers (PAs).
These meet the needs of commercial and military applications for obtaining highly efficient, high power PAs. These designs will extend battery life, lower operating temperatures, improve reliability and offer smaller overall footprints.
The MB series now offers all electronic active load pull capability from 200MHZ to 67GHz. While traditional passive tuning is physically limited by long wavelengths at UHF frequencies, Mesuro’s electronic solution is not affected by wavelength. Additionally, active tuning for fundamental or harmonic frequencies up to 67GHz is now available.
“Our customers require active tuning for a wide range of applications,” said Dr. Richard Emsley, CEO, Mesuro. “Whether it is for designing new wireless applications in the now available analogue TV bands or measuring the harmonics of military PAs, active load pull enables engineers to optimise their design in fewer iterations.”
The MB150 150W solution, combined with waveform engineering techniques, enables high power PA designers to calibrate their large signal models for different classes of operation. For example, the system allows for quick evaluation of devices in Class F, inverse Class F and class J modes of operation for ET and Doherty configurations.
“By comparing the measured impedance at the fundamental, second and third harmonics, as well as the voltage and current waveforms at the transistor current generator, we have been able to confirm the accuracy of our large signal models for our GaN HEMT transistor portfolio,” said Ray Pengelly, Strategic Business Development Manager, Cree.
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