JTak
Newbie level 2
Hi everyone,
I designed and fabricated LTC6946-4 PCB board.
According to the datasheet, VCO in the chip can produce signal in the frquency range 4.2~6.4GHz.
However, my PLL can generate only 4.4~5GHz when the voltage at TUNE pin is 0~5V.
Informations of my pll is here.
F_ref = 26MHz.
N = 1000
R = 5
O = 2(actually, i want the signal in 2.1~3Ghz)
Rz=930 ohm
Ci=1.54nF
Cp=0.13nF
The loop filter elements are calculated using PLLWizard from Limear technology.
Is there something I miss?
I designed and fabricated LTC6946-4 PCB board.
According to the datasheet, VCO in the chip can produce signal in the frquency range 4.2~6.4GHz.
However, my PLL can generate only 4.4~5GHz when the voltage at TUNE pin is 0~5V.
Informations of my pll is here.
F_ref = 26MHz.
N = 1000
R = 5
O = 2(actually, i want the signal in 2.1~3Ghz)
Rz=930 ohm
Ci=1.54nF
Cp=0.13nF
The loop filter elements are calculated using PLLWizard from Limear technology.
Is there something I miss?