An Approach for Characterizing the Frequency Response of Sampling-Oscilloscopes Using a Large-Signal Network Analyzer
Alirio De Jesus Soares Boaventura, Dylan Williams, Paul D. Hale, Avolio Gustavo
We propose an approach for characterizing the complex frequency response of sampling- oscilloscopes using a calibrated large-signal network analyzer (LSNA) and a broadband pulse source. First, we perform a full wave-parameter calibration of the LSNA using its internal CW sources. Then, we replace the internal CW sources with an external broadband pulse source and we measure it with the calibrated LSNA and with the oscilloscope under-test connected to the LSNA test port. The complex frequency response of the oscilloscope's sampler is derived in the frequency domain as the ratio of the oscilloscope signal to the calibrated LSNA signal. We achieve less than 0.7 dB amplitude difference and less than 5 degrees phase difference up to 45 GHz, compared to the previous NIST EOS characterization of the same sampler.
Soares Boaventura, A.
, Williams, D.
, Hale, P.
and Gustavo, A.
An Approach for Characterizing the Frequency Response of Sampling-Oscilloscopes Using a Large-Signal Network Analyzer, International Microwave Symposium Digest, 2019, Boston, MA, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=927381
(Accessed February 23, 2024)