txvco

Hi,

How can we correlate the TXVCO supply noise spectrum to TXVCO output modulation spectrum ? For the modulation mask limit by ETSI, should there be
also TXVCO supply mask to fit ORFS requirement ?

I use renesas RFIC, and found only TXVCO supply noise larger than other VCOs at
offset 400KHz ~ 1.2MHz. For different power control level(VAPC), meaning different input PA/TXVCO output impedance, could the supply noise spectrum be different ?

When I checked TXVCO supply noise, frequency centered at desired RF channel, higher peak value I could get for higher VAPC(power control level). WHY ?

Thanks!