Hello all.
I have some task. I need to trasmit and receive one digital package of QAM 64 modulation. What the phase noise must LO have for trasmitting and receiving?
LO trans. = 7.3 Ghz
LO receiv. = 5.5
Thank yoг for answer. Is it important to have a good dBc @1kHz, @10khz? For a exapmle, i have - 90dBc/Hz @100kHz and it's fine, but what dBc/Hz@10KHz needs for transmitting?
At these VCO frequencies and spacing from the carrier probably the PN slope is approximately 10dB/decade. So, the phase noise should be better than -80dBc/Hz @ 10kHz.
You need an RF system analysis to see other phase noise contributors.
At these VCO frequencies and spacing from the carrier probably the PN slope is approximately 10dB/decade. So, the phase noise should be better than -80dBc/Hz @ 10kHz.
You need an RF system analysis to see other phase noise contributors.
Thanks. if I undestood right the PN slope of the LO should be 10dB/decade to transmit and receive QAM signal without problem??? What other sources of phase noise do you know? Can an amplifier make worse the phase noise if it's used after LO?