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Applications
Hybrid Active Load Pull
Achieve high VSWR at the DUT reference plane with Hybrid Active Load Pull. Navigate complex test systems to optimize performance using feedback amplifiers, synchronized sources, and in-situ vector power wave measurement.
Features
A hybrid load-pull system combines the features of both active and passive tuning techniques to offer a versatile and efficient solution for impedance tuning in RF testing setups. By integrating an active loop with passive tuners, hybrid load-pull systems can leverage the benefits of both approaches.
Passive tuners, while effective in many cases, may struggle to synthesize complex impedance conditions, especially near the edge of the Smith chart for devices with very low impedance. Additionally, the presence of any loss between the tuner and the Device Under Test (DUT) reference plane, as seen in setups like On-wafer vector load-pull configurations, can further limit impedance synthesis capabilities.
In a hybrid load-pull system, the passive wideband tuner is used to create a reflection factor close to the optimal load impedance that may be challenging to achieve solely with passive tuning. The active power injection component then supplements this by generating additional reflection factors necessary to push the impedance conditions to the border of the Smith chart (Γ=1). This combined approach allows for enhanced mismatch conditions, which can result in lower power requirements compared to full active load-pull systems.
By merging the speed and tuning range advantages of active systems with the power handling capabilities of passive systems, hybrid load-pull setups offer a comprehensive solution for optimizing impedance matching in RF testing scenarios.
Setup for 18GHz
Setup for 67GHz
Setup for 120GHz
Setup for 18GHz
To increase the reflection factor at the probe tip (DUT) and minimize the power loss we must maximize S21 and minimize S11. Any mismatch loss must be compensated by additional injected power in a hybrid (active/passive) tuner.
Setup for 67GHz
Setup for 120GHz
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