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Looking for AGC circuit that uses AM and FM signals

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haerifar

haerifar

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AGC (help)

i need some circuit for AGC (automatic Gain Control)
that use for AM and FM signal .
can u help me ????
thanks for your help .
my email add. haerifar@yahoo.com
 

Re: AGC (help)

Do you need AGC loop design (mainly the lowpass filter) or blocks design including variable gain amplifier(VGA), amplitude detector etc?
 

Re: AGC (help)

For FM you do not actually need AGC. Limiters in the IF strip are usually used. There is the rare case when you need to reduce the gain befor the first mixer but this is rarely done.

The Amateur Radio Handbooks by the RSGB and ARRL are full of information for radio electronic designs. These are frequently available at city libraries.
 

Re: AGC (help)

haerifar said:
i need some circuit for AGC (automatic Gain Control)
that use for AM and FM signal .
can u help me ????
thanks for your help .
my email add. haerifar@yahoo.com
Click to expand...

Gererally I use jfet(j309,ect.) or dual-gate mosfet(BF998etc.) for IF AGC.
 

Re: AGC (help)

This is really a good book
Where is the e-book?
quote="flatulent"]For FM you do not actually need AGC. Limiters in the IF strip are usually used. There is the rare case when you need to reduce the gain befor the first mixer but this is rarely done.

The Amateur Radio Handbooks by the RSGB and ARRL are full of information for radio electronic designs. These are frequently available at city libraries.[/quote]
 

Re: AGC (help)

which is your IF frequency?
there is one
 

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