Other Parts Discussed in Thread: TRF3722
Hello,
I am using the TRF372017 in fractional mode with a carrier around 2GHz. I have the loop filter set near the 30.72MHz fPFD example within table 30 in the datasheet. With only a carrier on the RF output the phase noise on the LO port is measuring ~1degree in my band of interest. When I input pseudo random data onto the BB input the RF spectrum appears as expected on the RF output. The modulated output also appears on the LO output, looking like an RF output with horrible carrier suppression. How much isolation should I expect between the LO output and the RF output? Are there possibly settings within the device that I could have not tuned properly that would cause this?
Thanks,
-Brandon