How to enhance turning speed of cmos vco?

[congqingzm]

Does anyone has some idea about it? It's related to some parasitic parameters, is it? Thanks!

 

[Syukri]

You should further this question to the "Analog IC design forum" there's some people that can tell u this answer,.

 

[Cluricaun]

Topic moved here

 

[VSMVDD]

i think your meaning the tuning speed

tracking this is called you want a faster freq change ???

then this isnt the cmos its your circuit

paste a copy of your vco with problems and let's see
perhaps you have too much capacitance somehwere in your circuit
and this is introducing lag

:| you question is open ended

 

[hrkhari]

One way is utilizing an A-MOS varactor, which has wide tuning range, but highly sensitive, make sure the on-chip inductor used is reasonably small, so that the parasitics does not dominates.

Rgds