Gain Compression with behavioral simulations - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 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. 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

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

ultralowpower

Post subject: Gain Compression with behavioral simulations

Posted: Wed Apr 14, 2010 1:25 pm

Lieutenant

Joined: Tue Apr 13, 2010 4:00 pm

Posts: 1

Hello everyone,

I have a "problem" concerning gain compression in top-level testbench considering overall system.

The TX budget is as below:

RF side -- external rf diplexer -- external PA -- external RF filter -- rf amp -- 2nd mixer -- external if filter -- 1st mixer -- if amp -- external if diplexer -- IF side

all RF blocks has 50 ohms ref. impedance and IF blocks 75 ohms impedance.

I am using behavioral models in verilog-a in each block. I am having compression gain in 2nd mixer (specified in the model as 7 dB and simulated 4.5 dB) and rfamp (specified 10 dB and simulated 8.5 dB). Also, external PA had simulated gain 2 dB more than specified.

I am trying to understand why it is happening because apparently blocks linearity is ok to avoid gain compression.

I thank if anyone has an idea about this.

Posted 11/12/2012


Please Support RF Cafe by purchasing my ridiculously low−priced products, all of which I created. RF Cascade Workbook for Excel RF & Electronics Symbols for Visio RF & Electronics Symbols for Office RF & Electronics Stencils for Visio RF Workbench (shareware) T-Shirts, Mugs, Cups, Ball Caps, Mouse Pads These Are Available for Free Calculator Workbook Smith Chart™ for Excel

About RF Cafe Copyright: 1996 - 2024 Webmaster: Kirt Blattenberger, 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 Mail" when a new message arrived... 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: AirplanesAndRockets.com