Patent ID: 9575107
Date: 2017-02-21
CPC Classifications: G01R,H03C

Claim:
1. An electronic arrangement for providing a signal characterized by reduced phase noise, comprising: a first signal source defining an output and arranged for providing a stimulus signal; a modulator coupled to the output of said first signal source and arranged for generating at an output a modulated signal as function of said stimulus signal and a local oscillator signal, said modulated signal being substantially identical to said stimulus signal and being offset by a frequency of said local oscillator signal; a first mixer defining first and second inputs and an output, the output of said first signal source being coupled to the first input of said first mixer, the output of said modulator coupled to the second input of said first mixer, said first mixer arranged to generate a mixed signal that includes a difference of said stimulus signal and said modulated signal, whereby said difference cancels a phase noise associated with said stimulus signal; wherein said modulator is an IQ modulator; and further comprising, an in-phase digital-to-analog converter coupled to an in-phase input of said IQ modulator, a quadrature digital-to-analog converter coupled to a quadrature input of said IQ modulator, said in-phase and said quadrature digital-to-analog converters arranged to generate in-phase and quadrature components defining said local oscillator signal.