Hi guys,

I'm currently designing a latched comparator working with a 200 MHz ideal clock in Spectre Simulator with CMOSP13 IBM technology. I don't know if its best to implement this 200 MHz clock on-chip or to have an output signal linked to an off-chip clock generator. As I have no experience with circuit working with a clock, I don't know which option is best in terms of precision ? My guess is going with an on-chip clock, but which topology,  taking in consideration low complexity and low space ? A VCO, or do I need a PLL for this frequency ?

Thanks for your help,
gsensor

Why ? Isn't an external clock more imprecise due to propagation delays and external noise, than an on-chip clock with a good layout design ?

Ok, thanks guys for your advice. I will use an external crystal oscillator.