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
Unread postPosted: 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 is needed.
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)?