Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
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PCB detector circuit - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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