Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Need some ideas on how to develop AGC ?

Status
Not open for further replies.

elecs_gene

Member level 2
Joined
Dec 20, 2005
Messages
52
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,288
Activity points
1,797
AGC

hi
can someone give me some ideas on how to develop AGC?i recently,tried one but found that it works only for a very small range.i used a FET as a variable resistor to vary the input voltage to the amplifier based on the applied input voltage. is this not a good method of designing it?any reply in this regard would be appreciable..

regards
 

paulux

Advanced Member level 4
Joined
May 16, 2005
Messages
112
Helped
11
Reputation
22
Reaction score
2
Trophy points
1,298
Activity points
2,339
Re: AGC

FET is a good candidate of voltage-controlled variable resistor. I guess your problem might be due to the controlled circuit. It might be helpful if you could provide the details & schematics of your circuit.
 

artem

Advanced Member level 4
Joined
May 22, 2003
Messages
1,350
Helped
126
Reputation
252
Reaction score
32
Trophy points
1,328
Location
Turkey
Activity points
13,461
AGC

there are ready to use variable gain amplifiers, e.g. from analog devices.
 

OMEsystem

Advanced Member level 4
Joined
Dec 1, 2005
Messages
103
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,296
Activity points
2,073
Re: AGC

The AGC range is decided by how small the MOS resistance you can obtain.
So, you have to make sure your MOS resistor with enough W/L and hihg/low
control voltage.

Added after 59 seconds:

elecs_gene said:
hi
can someone give me some ideas on how to develop AGC?i recently,tried one but found that it works only for a very small range.i used a FET as a variable resistor to vary the input voltage to the amplifier based on the applied input voltage. is this not a good method of designing it?any reply in this regard would be appreciable..

regards
BTW, What's the AGC range you need?
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top