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ALC (automatic level control) - RF Cafe Forums

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 Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


sma100
Post subject: ALC (automatic level control)
Unread postPosted: Tue Mar 16, 2004 1:28 am
Offline
Lieutenant

Joined: Tue Mar 16, 2004 1:26 am
Posts: 1
Hello,

Anybody know how I can design an ALC circuit with a pin attenuator and a crystal detector. Freq range (DC - 500 MHz).

Thanks.


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Doug
Post subject: ALC
Unread postPosted: Tue Apr 20, 2004 3:40 pm

Coupling off the output, convert to dc with the crystal detector and varyig the PIN diode with the dc at the input. :|


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Kirt Blattenberger
Post subject:
Unread postPosted: Tue Apr 20, 2004 9:15 pm
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Site Admin
User avatar

Joined: Sun Aug 03, 2003 2:02 pm
Posts: 308
Location: Erie, PA
Greetings SMA100:

* Here's a really good App Note on how to build a PIN atteunator from Alpha Industries (now Skyworks).


...and another from General Microwave (now Herley).


* Here's an App Note from Agilent for a detector.


...and another from the Electronic Warfare Handbook site.


These and others can be found on the App Notes page right here on RF Cafe.



Good luck to you.


- Kirt B. :mrgreen:


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Puck
Post subject:
Unread postPosted: Wed May 05, 2004 3:30 pm

Think about the time response and you will get it. With properly made ALC you can get 6dB or more s/n ratio for voice. Video is different. Generally it provides dynamic range compression.



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