cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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 08 Jan 2005 2:44 Strange PLL lock problem? |
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Hello,
I am testing a 2.4G PLL.
This PLL couldn't lock if just after power-on, and vco free-run at 2480MHz, vtune=0v. When I increse both vco current and vco's tuning cap, the PLL can now lock in 2400M-2490MHz. After this, I decrese both vco current and vco's tuning cap to original value, then the PLL also can lock 2400M-2490MHz.
Why the PLL could lock after it has been increased and then decreased current and cap, since the value is as same as it's just after power-on?
Thanks!
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