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I use LM567 as a PLL,get the output signal of pin 5.
The LM567 is locked with a square wave output from pin 5 of 500KHz,then to a AD8039 as the voltage follower,but the freq at the output of the voltage follower is moved to 539KHz,I was really confused about it.(I use AD8039 to remove the effect to the VCO freq in pin 5 by LC LPF),so the latter circuit goes wrong.
But when I give the AD8039 a 500KHz square signal directly from signal source,the output of the voltage follower is also 500khz,and the following circuit becomes normal.