super
Full Member level 2
vco problem...
Dear all :
I'm doing 8bit VCO(complementary) for control frequency.
when I sim tank and cap array (only NMOS varactor)
is 580f and 850f for control bit min and max and step is 1f.
According these value we can get freq=4.4G~5.4G ,step=5Mhz.
when I run transient, the fmax=5.39G but fmix=4.8G ,
I don't know what happen .
someone have this experience or have some suggestion ?
Thanks ..
Dear all :
I'm doing 8bit VCO(complementary) for control frequency.
when I sim tank and cap array (only NMOS varactor)
is 580f and 850f for control bit min and max and step is 1f.
According these value we can get freq=4.4G~5.4G ,step=5Mhz.
when I run transient, the fmax=5.39G but fmix=4.8G ,
I don't know what happen .
someone have this experience or have some suggestion ?
Thanks ..