Eric
Guest
Sun Jun 27, 2010 11:52 am
Hi,
is there application note or an explanation on how can we measure
VCO's loop gain using the CMDMProbe?
B.R
Mobil
Guest
Wed Jun 30, 2010 2:30 am
On Jun 27, 6:52 pm, Eric <arik...@gmail.com> wrote:
Quote:
Hi,
is there application note or an explanation on how can we measure
VCO's loop gain using the CMDMProbe?
B.R
I'm thinking of that using a port to measure the negative resistance
(like real(Z)) would be simple.
Andrew Beckett
Guest
Mon Jul 12, 2010 10:29 am
Eric wrote, on 06/27/10 09:52:
Quote:
Hi,
is there application note or an explanation on how can we measure
VCO's loop gain using the CMDMProbe?
B.R
Look in
<MMSIMinstDir>/tools/spectre/examples/SpectreRF_workshop/SpectreRF_AN/PstbAN.pdf
This talks about using pstb versus stb for stability analysis of a VCO. Using
cmdmprobe for differential stability (rather than single-ended stability) is no
different than from non-periodic analyses. You can only use it for balanced
loops (i.e. no significant CM->DM or DM->CM leakage) and it can measure either
common-mode or differential-mode stability based on a parameter on the cmdmprobe
instance (there's a solution on Cadence Online Support for this, I'm sure).
Regards,
Andrew.
