Post subject: diode characterization by NWA, max operating
Unread postPosted: Wed Jul 06, 2005 8:39 pm
I have checked an diode at DC and low freq and verified
that it works as an diode, but how should I being able to "proof"
the maximum operating freq for my diode if I want to use it for
high freq applications (0.1GHz to 3Hz)?
My intention is to
use an 2-port NWA there the diode is connected in series and measured
with zero bias at various freq. and power levels. How to use and
interpret the results etc and how to check max operating frequency
for the diode? :cry:
Unread postPosted: Thu Jul 07, 2005 9:31 am
I would forward
bias the diode like switch with DC bias and use the network analyzer
to see where the insertion loss rolls off to the 3dB point. That
would be your Fmax. Make sure you have DC blocking and an inductor
for the return for the current.
Post subject: fmax diode 2-port meas NWA?
Fri Jul 08, 2005 9:33 am
Is it necessary for the 2-port
series connected diode to include the inductor to ground at say
the right port when NO forward dc-bias is connected to the diode?
That means, only the diode is series connected with the microstrip
to the 2-port NWA for being able to characterize the S21/S12 -3dB
cutoff, fmax for the diode.
The diode is intended to be used
as an rectifier for RF input with NO bias where the diodes fmax
Should I also make my own calibration set to remove
the losses for the microstrip and if necessary also include the
inductor to ground in the calibration set (say thru, reflect, line)?