lotoy
Member level 1
hello,
I meet some problems in vco simulation.
(1)how can i get the curve of frequency or varactor capacitance versus tuning voltage in spectreRF? especially the curve of varactor capacitance vs tuning voltage.without it ,i don`t know the value of varactor in given controlling voltage,so i can`t fixate the frequency and tuning range in given voltage.
(2)some paper said(i can`t remember exactly) the phase noise is the lowest
when output voltage swinged at the border of current-controlled area and voltage-controlled area. but in my simulation in cadence spectreRF,the larger the output swing is ,the lower phase noise will be. that mean,phase noise is only determined by output swing. is it true ? i don`t know why,pls help me .
thanks in advance!
I meet some problems in vco simulation.
(1)how can i get the curve of frequency or varactor capacitance versus tuning voltage in spectreRF? especially the curve of varactor capacitance vs tuning voltage.without it ,i don`t know the value of varactor in given controlling voltage,so i can`t fixate the frequency and tuning range in given voltage.
(2)some paper said(i can`t remember exactly) the phase noise is the lowest
when output voltage swinged at the border of current-controlled area and voltage-controlled area. but in my simulation in cadence spectreRF,the larger the output swing is ,the lower phase noise will be. that mean,phase noise is only determined by output swing. is it true ? i don`t know why,pls help me .
thanks in advance!