Patent ID: 11933848
Assignee: NATIONAL INSTRUMENTS IRELAND RESOURCES LIMITED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for determining at least one characteristic of a device under test, DUT, as a function of time across a frequency range of a periodic modulated signal, the method comprising:
a) generating a first periodic modulated signal across the frequency range
b) generating a second periodic modulated signal with a frequency offset from the frequency range;
c) performing a measurement, at one or more ports of a plurality of ports of the DUT while the first periodic modulated signal is applied to a first port of the DUT and the second periodic modulated signal is applied to a second port of the DUT, of one or more of
voltages and currents, or
incident and reflected waves,

wherein performing the measurement comprises
obtaining probed signals by probing one or more of
the voltages and currents, or
the incident and reflected waves,

receiving two probed signals of the probed signals in a multi-channel receiver structure comprising a plurality of receivers, wherein in each of the plurality of receivers a corresponding one of the two probed signals is phase coherently digitized with a respective digitizer having its own sample clock, wherein the respective sample clocks of the plurality of receivers are synchronized in a synchronization block comprising a reference clock derived from a master clock, and
processing the phase coherently digitized probed signals to obtain one or more of
the measured voltages and currents, or
the incident and reflected waves; and

d) determining the at least one characteristic as a function of time across the frequency range, using one or more of
the measured voltages and currents, or
incident and reflected waves.