Multiharmonisches Source- und Load-Pull Messsystem zur Charakterisierung aktiver Bauelemente mit WCDMA-Signalen
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Beschreibung
Continuously growing data rates in modern communication systems for mobile applications offer challenging problems to measurement techniques for device characterisation. In particular, two-tone signals were commonly used to identify power delivered to adjacent channels. However, these signals do not represent the stochastic and continuous frequency-band characteristics of real-world communication signals.
This work focusses on the development of a new, complex and versatile measurement system, in order to close this gap. It allows the characterisation of active microwave devices using single- and two-tone, as well as real world communication signals. Due to an ultra-broadband receiver, the system is not restricted to certain modulation bandwiths dictated by the receiver, allowing the system to cover the whole frequency band of the first three harmonics of a common UMTS-signal with one shot. Moreover, the system is also able to cover even future communication standards because of the ultra-broadband concept. The system can be extended to a multiharmonic source- / load-pull system, using in-house developed multiharmonic sliding-load tuner systems. This allows detailed device characterisation in a non-50 Ohm-environment. By simultaneous tuning of the source and load impedances, the system offers a short way to experimentally defined optimum impedances for the design of active circuits, e. g. amplifiers. The tuner-systems were designed to be very compact, allowing a less space-consuming setup, thus avoiding unnecessary cable connections and increasing the measurement accuracy. The implemented system software allows the rescaling of all power-waves to the device under test. Additionally, algorithms for interpolation and processing of the measured data have been implemented, helping to interpret the measured results.
Autor*in
Benjamin Wittwer