A method is proposed to generate an RF multi-tone (up to 10 GHz) calibration signal with a very narrow harmonic spacing (down to 100 KHz) and a known phase relation between tones. This signal is requested for the phase calibration of a nonlinear vectorial network analyzer on a dense grid, as occurs when modulated signals are measured. The phase relation is traceable to a nose-to-nose calibrated microwave sampling oscilloscope.
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