Automatic Gain Control Chip Selection

Hello,

I'm looking for help in selecting a chip for an Automatic Gain Control circuit. My requirements are

Input signal: 0.1Hz-100Hz, random waveform, 50mV-4Vpk

Output needs to be an exact replica of the input but normalized to always have a 4.8V peak.

I've run into a few chips that have AGC, like the AD8367 and AD8336, but I'm not sure if they are right for my application.

much thanks!

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  • Hi,

    Thanks for the email, I'm familiar with both of these parts. For such a low frequency application you'll need a VGA designed for dc operation. These are generally lower BW, with specified Vos numbers and dual supply. Your input range is only 80:1 (38dB) so you could use the AD600, AD602, AD603, AD8336 or AD8338. Avoid single supply parts if possible. There are a few agc circuits for guidance, one of them is AN-1341, which I've attached for your convenience.

    Good luck!!

    js

Reply

  • Hi,

    Thanks for the email, I'm familiar with both of these parts. For such a low frequency application you'll need a VGA designed for dc operation. These are generally lower BW, with specified Vos numbers and dual supply. Your input range is only 80:1 (38dB) so you could use the AD600, AD602, AD603, AD8336 or AD8338. Avoid single supply parts if possible. There are a few agc circuits for guidance, one of them is AN-1341, which I've attached for your convenience.

    Good luck!!

    js

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