Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: PCB detector circuit
Mon Sep 06, 2004 5:47 am
Sep 06, 2004 5:43 am
I am new to Rf design, and have
to design PCB layout for a detector circuit
using a voltage doubler
I am simulating using MIcrowave Office and simulating
my matching circuit (double open stub).
1) I'm a bit stumped
with the results of my simulation in terms of S parameters. They dont
seem to change much, even when I remove or place a 100pF capacitor in
parallel with load.
2) Am unsure about designing my microstrip
matching element in PROtel. Any tips on this?
Unread postPosted: Wed
Sep 08, 2004 3:32 pm
We're going to need a little more information.
- What frequency range is the detector working in?
- What is
the impedance of the detector?
- What kind of substrate are you using?
- Are you using S-parameter files for the discrete components being
modeled, or mathematical models from the simulator?
can explain the small change with or without the 100 pF capacitor.
Regarding impedance matching, MWO should provide libraries of impedance
transformer topologies, then the optimizer should take care of tuning.
Post subject: detector circuit
Unread postPosted: Tue Sep 14, 2004 11:43 pm
I am using a voltage
doubler configuration using Schottky HSMS 8202 from Agilent. I am planning
to use it at 900MHz
Im planning to use two different materials, FR4
and ROdgers duroid 5880, Er=2.2
Im using MWOffice's SPice model
of diode to model 8202 schottky, using Agilent supplied Spice parameters.
Is this sufficient to model the diodes in MWOffice, or should I be doing
I have been using the optimizer to vary the length of the
stubs to obtain the best S11 and S22 values from linear simulator. Is
Any help would be great as I am a complete
newbie to this area and a desperate undergrad