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2 Tone Test of a LC-VCO and LDO: Best setup to get a reliable Phase Noise simulation

dtzlou

Hi all,

I have an LC-VCO and an LDO with a very bad PSRR at frequency 250KHz (gain is positive!). I apply 20mV, 250KHz sinewave tone at the input of the LDO (VIN) and I want to check the PSRR impact on the VCO Phase Noise at this specific frequency 250KHz. The VCO frequency is 3GHz.

I am playing with HB + HBnoise setup but I am not 100% sure If i follow the correct setup in order to get accurate and meaningful results. Below you can see my HB and HBnoise setup settings:

HB Setup:

HBnoise Setup:

  • Do I need  to increase the Oversampling factor to get more accurate results?
  • Since I apply a sinewave tone at the input of the LDO, the harmonic number of this tone (the 2nd one) must be 1, right?
  • Do you recommend other simulation setup or this one is good enough to check the impact of the LDO modulation at the VCO Phase Noise

Thanks, kind regards

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