An Oscilloscope Correction Method for Vector-Corrected RF Measurements
This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination. IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1 An Oscilloscope Correction Method for Vector-Corrected RF Measurements Sebastian Gustafsson, Student Member, IEEE, Mattias Thorsell, Member, IEEE, Jörgen Stenarson, Member, IEEE, and Christian Fager, Member, IEEE Abstract— The transfer characteristics of the RF front-end circuit components. As these errors must be compensated for circuitry of a real-time oscilloscope (RTO) are not only frequency to achieve accurate signal sampling [4], several correction dependent and nonlinear with signal amplitude but also depen- techniques have been introduced [5], [6]. Other correction dent on the voltage range setting of the oscilloscope. A correction table in the frequency domain is proposed to account for the techniques have also been introduced [7]–[12], but they are additional gain and delay introduced when switching between only valid for sampling oscilloscopes. Previous research different voltage ranges. The table was extracted from the has focused on correction techniques for a certain set of measured data in which a continuous-wave signal source was instrument settings, e.g., a particular voltage range. Hence, connected to the oscilloscope ports, whereas the input power, the changing the settings would make the correction invalid. frequency, and voltage ranges were varied. The importance of the corrections is demonstrated by its use in an RTO-based two-port However, changing the range is desirable in some applications, vector-corrected measurement system. Measurements from the to fully utilize the voltage range of the ADC.
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