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What types of analysis should I do to confirm ring VCO functioning?

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Re: Ring VCO

sp said:
I have a VCO question, i will just ask here instead of creating another one, hope have people will clear my doubt.

I have a VCO circuit and after i spend some time with it, i found out that it actually is just even number of inverters and i wonder why an even number of inverters chain can oscillate. i run spice on it and it actually does oscillate.

do anyone have any recommendation on any book on VCO, i read razavi book but it has no explanation on it and maybe it's just my understanding is bad.

thank you in advance.

regards
sp
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As I know, the differential ring osc can use even number of inverters. In razavi book you will find it.
Because in differential,the output can cross put to another inverter's input, so the phase can satisfy the Barkhausen's law, then it can oscillate.
 

Ring VCO

Yes you can use even number of stages when using a differential delay cell topology.
But if you are using a inverter based delay cell, you need to have odd number of stages for oscillation

--cmos_dude
 

Re: Ring VCO

Even stages of inverter can't oscillate. Maybe there is some mistake in your schematic.
 
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