weigo
Newbie level 2
lc vco switch cap
Hi.
I am running some simulations about LC VCO in spectreRF. In order to extend the tuning range without increasing VCO gain, a swithing cap architecture for frequency coarse tuning is used. (plz see the file attached for reference)
While runing the phase noise simulation, if the MOS of switch cap is off, the result phase noise will be dominated by the switch MOS. I dont know why this happen...
Isnt the switch MOS turned off??
Should I add some DC path to bias the internal node??
Thanks!!
Hi.
I am running some simulations about LC VCO in spectreRF. In order to extend the tuning range without increasing VCO gain, a swithing cap architecture for frequency coarse tuning is used. (plz see the file attached for reference)
While runing the phase noise simulation, if the MOS of switch cap is off, the result phase noise will be dominated by the switch MOS. I dont know why this happen...
Isnt the switch MOS turned off??
Should I add some DC path to bias the internal node??
Thanks!!