Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums RF Cafe Homepage Thank you for visiting RF Cafe!

Zero Biased Schottky Detector Problem - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: zero biased schottky detector problem Posted: Fri Aug 05, 2005 1:10 pm

I am sorry for the newbie question. RF is not my expertise and I need a few concepts to set up a small test bed.

I have designed a detector using zero biased schottky diode in voltage doubler configuration using Agilents HSMS 2852 package. I have mounted the SOT23 package along with relevant matching components on a 31 mils FR-4 board. I provide RF input throught a signal generator at 900 MHz using end launch SMA connectors. The output is measured using a Volt meter.

My problem, is that the measured performance is nowhere close to what is mentioned in the data sheet (which I also get on simulation). The output DC voltage is much lower that mentioned in data sheet at the input power levels. How can I go about "debugging" this problem?


Another Guest
Post subject: Zero-bias Schottky detectorPosted: Sat Aug 06, 2005 11:12 am
Please tell us a bit more about the operating conditions - like what is the RF voltage?

Voltage doubler circuits don't work too well in the square-law region, so you have to have enough voltage to get above it into the exponential region. In the case of Schottky diodes, one reason simulations sometimes are inaccurate is poor modeling of the diode capacitance.

Good luck!


Post subject: Posted: Sat Aug 06, 2005 7:06 pm
In the actual system, the detector will be working with power levels of 0dBm to -25 dBm.
However, right now, I am trying to test the performance of the detector circuit alone. I am varying the input power level and trying to reproduce the charecteristic shown in the data sheets and application notes.

For instance, application note 1089, shows that the DC output produced using the voltage doubler, at -30dBm, 900MHz input is about 30mV. On measurement for my detector i get output of only about 1 -2mV.

I am just unsure about where the problem might lie and to go about finding it.


Another Guest
Post subject: Voltage DoublerPosted: Sun Aug 07, 2005 7:44 pm
How does your circuit differ from the one in AN-1089, both schematically and physically?


Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Kirt Blattenberger,

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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !