I've been using ADF4156 to design Local Oscillators at frequencies in the range of 5 to 6 GHz.
I use ADISimPLL and Fraction N software for the design.
I haven't faced any difficulties in the LO design at the above mentioned frequencies; but, i am facing difficulties in designing a LO at 1911.642 MHz.
The LO worked fine initially, but, strangely enough, it stopped working afterwards.
The charge pump output voltage is at 0.4V to 0.5V no matter what register configuration i use.
Further, the PLL chip gives out 5V at the charge pump out if i only enable the charge pump supply.
I've also designed a test PCB of ADF4156, but the PLL chip responds the same way.
Kindly help me in resolving this issue.
Am i programming the chip wrong?
It should not be the case as the LO was working initially.
An example for designing the LO at 1911.642MHz using Fraction N software and ADISimPLL would be highly helpful.
Thanking you in anticipation.
With best regards,