Z
ZenSafari
Hello--
I am currently constructing a miniaturized spectrum analysis unit and
am having some troubles with my local oscillator sources. The problem
is that my VCO output (in a PLL) is rife with noise...not only phase
noise but broadband noise upto about 3GHz. I need to stabalize my LO
sources so that when I drive my mixers I am not injecting additional
frequencies into the mixer.
For those of you with RF PCB layout experience, can you give me some
hints as to how to best layout a PCB for the LO source? I have
separated my digital and analog ground planes (digital ground for
Analog Devices PLL synth chip) but on my prototype PCB I realized today
that some of my analog ground overlaps the digital gournd on a
different layer...oops. anyways, for those of you with extensive
epxerience in this area, i could sure use your help as to how to get my
LO source outputs to remain spectrally pure.
If I am unclear, please let me know and I can clarify further.
Thanks in advance,
Chris
I am currently constructing a miniaturized spectrum analysis unit and
am having some troubles with my local oscillator sources. The problem
is that my VCO output (in a PLL) is rife with noise...not only phase
noise but broadband noise upto about 3GHz. I need to stabalize my LO
sources so that when I drive my mixers I am not injecting additional
frequencies into the mixer.
For those of you with RF PCB layout experience, can you give me some
hints as to how to best layout a PCB for the LO source? I have
separated my digital and analog ground planes (digital ground for
Analog Devices PLL synth chip) but on my prototype PCB I realized today
that some of my analog ground overlaps the digital gournd on a
different layer...oops. anyways, for those of you with extensive
epxerience in this area, i could sure use your help as to how to get my
LO source outputs to remain spectrally pure.
If I am unclear, please let me know and I can clarify further.
Thanks in advance,
Chris