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