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LC tank VCO start up

 
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jecyhale



Joined: 19 Feb 2008
Posts: 402
Helped: 39
Location: China
Post09 Jul 2008 5:17   LC tank VCO start up
I have two questions:

1, how to make sure that the VCO will start up?
2, Can we design the start up time exactly.

Thanks.
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Blackuni



Joined: 12 Apr 2007
Posts: 110
Helped: 11
Post09 Jul 2008 7:05   Re: LC tank VCO start up
Hi,

Whtz the topology?

if its a colpits then condition for start up is
gmc = ω^2*Rs*C1*C2
gm > k * gmc

whr gmc is critical transconductance.
gm is u r ckt ,,
Rs --> losses in u r tank.

thnx
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