Active load pull tuning is, because of limited tuning range of passive tuners, additionally reduced by fixture and probe insertion loss, the only method allowing test engineers to reach up to |Γload|=1 (RDUT=0Ω) to match any DUT at its reference plane. In closed loop active tuning, part of the extracted RF power from the DUT is amplified and fed back into the DUT output port, creating a virtual load. Since the re-injected power can be higher than the original extracted power, Γ can be >1, meaning that insertion loss can be compensated. Using two (or more) synchronized (coherent) sources allows open-loop active (and harmonic) tuning; in fact the loop here is also closed, but, instead at RF, it is closed at IF synchronizing reference.
Focus offers also active source pulling technology, based on the Gamma Boosting Unit (GBU) and several associated techniques. Active load pull requires high power feedback amplifiers. Combining with pre-matching passive wideband (CCMT) or harmonic (MPT) tuners, in a Hybrid configuration, allows reducing the PA requirements by a factor of 10. The RAPID electronic active tuner technology, developed by MESURO, allows high speed load pull (50 points/second), 100 MHz modulated signal as well as hybrid and harmonic tuning.
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Focus Microwaves’ RAPID digital tuner is the heart of a precision, high-speed, load pull device characterization system. The RAPID has been developed by Focus’ UK subsidiary MESURO and is suitable for every phase of the design and production test cycle. This series of new digital tuner products provide performance, reliability, and cutting edge features for a reasonable cost.
The RAPID series is compatible with the hardware and software of existing labs, thereby allowing users to easily upgrade their existing systems.
The RAPID can be used as a standalone impedance synthesis and measurement system, or combined into a hybrid solution when paired with Focus’ MPT series harmonic tuners. The passive tuners can be used to synthesize fixed harmonic impedances in a high speed fundamental active setup. With this modular configuration the user benefits from speed, increased tuning range for F0, CW, pulsed and modulated signals while reducing cost and simplifying the system.
RAPID employs CCMT & MPT prematching technology, protected by the following patents: 9,459,336 / 9,213,056 / 8,497,689
RAPID uses exclusively our proprietary technology, protected by the following patents:
Below are a selection of graphs generated by the RAPID Phase reference and Software Suite