Patent ID: 8842771

Claim:
A method of calibrating an RF signal source, the RF source being of the type having a baseband signal generator, a correction filter and an up-converter coupled in series, for amplitude flatness and phase linearity of an RF signal output comprising the steps of: generating from the baseband signal generator a plurality of equal amplitude frequency tones having a specified average frequency and specified frequency separations between the tones such that the equal amplitude frequency tones are non-harmonic with respect to each other; computing from the RF output signal a magnitude and group delay for the specified average frequency; computing a phase response for the specified frequency separations; stepping the specified average frequency from the baseband signal generator across a specified frequency bandwidth and repeating the generating and computing steps at each specified average frequency; and calculating filter coefficients for the correction filter from the magnitude and phase responses so that the RF signal output has amplitude flatness and phase linearity across the specified frequency bandwidth.