Active Load Pull

Break through the limitations of passive tuners with Active Load Pull. Achieve perfect impedance matching and compensate for insertion loss using advanced feedback techniques and synchronized sources.

Applications Hero Background


Active load pull systems were indeed developed to address the limitations of passive tuners, particularly the restricted tuning range. While passive tuners offer advantages in terms of power handling, and user-friendliness, they can experience a significant reduction in tuning range at the Device Under Test (DUT) reference plane due to insertion losses between the tuner and the DUT.

Active load-pull systems, which operate by injecting signals directly at the Device Under Test (DUT) plane, have the capability to synthesize high reflection coefficients. By actively compensating for the inherent losses present in passive tuning techniques, active load-pull systems can effectively overcome limitations and provide full Smith chart coverage. This ability to generate high reflection coefficients allows for a more comprehensive exploration of the impedance matching conditions across the Smith chart, enabling engineers to optimize the performance of RF circuits and devices.

One approach to active load pull tuning involves closed-loop tuning, where the feedback loop is utilized to fine-tune the matching conditions. Alternatively, in open-loop tuning, synchronized coherent sources are used to adjust the tuning parameters, with the feedback loop closed at the intermediate frequency (IF) synchronizing reference rather than at RF.

Both closed-loop and open-loop tuning methods offer unique advantages and can be crucial in achieving optimal performance in RF testing setups.

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