the figure1 is a double band frequency tripler. The so called "double band" means it has two frequency tuning ranges which can triple the frequency. And we can make this by tuning the DC voltage "Vtune", which control the combination of varactors and resistors(showed in the red circle in fig1 and fig2) to change the free running osicallation frequency, so that frequency tuning range change . That means, the two frequency tuning range transfer between each other when tuning the DC voltage Vtune, but during the transferring, it has the hysterisis phenomenon, which means the curve of free running osicallation frequency vs Vtune for Vtune low to high is different from that for Vtune high to low. I want to ask that, how to make this hysterisis effect by cadence, like the fig3.
