METHOD AND APPARATUS FOR SPECTRAL STITCHING USING REFERENCE CHANNEL AND PILOT TONES
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United States of America Patent
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Feb 16, 2017
app pub date -
Aug 11, 2015
filing date -
Aug 11, 2015
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Abstract
A system and method sequentially measure the amplitude and phase of an output signal of a device under test in each of two or more frequency ranges which together span the output signal spectrum, using a local oscillator (LO) signal whose frequency and phase change for each measurement. The measured phase of the output signal is adjusted for at least one of the frequency ranges to account for the change of phase in the LO signal from measurement of one frequency range to another frequency range, including applying to the measured phase a phase offset determined by measuring the phases of two pilot tones in the two or more frequency ranges, using the LO signal. The phase-adjusted measurements of the output signal in the two or more frequency ranges are stitched together to determine the amplitude and phase of the output signal across the output spectrum.
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