×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

AGC LNA design

AGC LNA design

AGC LNA design

(OP)
Hi,

does anyone know where I can find documentation about how to implement a LNA with AGC? I need this for a commercial FM receiver LNA. Since now I had a LNA without AGC but I would need to include the control as an independent block.

I guess the block diagram for this AGC is something like a coupler and comparator. But I would need a complete schematic to get to know how it is implemented.

Thanks in advance.

RE: AGC LNA design

Typcially you would use a variable gain amplifier (VGA) and a detector. The detector output then controls the VGA. Typically the VGA stage is not the first stage in the LNA chain and not the last stage in the LNA chain, but somewhere in between. The reason is to keep the noise low without overloading the VGA.

Depending on noise requirements and signal requirements the position of the VGA relative to other stages will change.

RE: AGC LNA design

(OP)
Logbook,

thanks for your comments. I´ll keep you inform of my progress!.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources