cqmyg5
Advanced Member level 4
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!
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!