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AGC loop

iliya tzukerman
Intellectual 450 points
Other Parts Discussed in Thread: MPY634, LMH6505

Hello i am trying to bulid  a simple loop of agc  and i need to choose a vca for it but i  am little bit Confused  since all vca i have seen r talking about ac coupling and i need for dc voltage for example vin=1(v) vcontrol =2(v) gain =2, and if  i change Vin i want the gain be the same if the Vcontrol is the same.

So  if u see i have a big mix up in my mind please help me to figure it out.

Thx. 

  • 0
    Guru 21975 points

    Iliya,

    Please check the MPY634. This device is a four-quadrant multiplier. Transfer function is Vo = XY/10 where both X and Y can be positive or negative.

    It may be possible that one of our VCA products could provide your required functionality but these products are not supported on this forum. If you want to check on this possibility you may want to post another question on the high speed amplifiers forum.

    Regards, Bruce.

  • 0 in reply to Bruce Trump
    TI__Mastermind 22825 points

    Hello All,

    Additionally here is an AGC circuit in the LMH6505 datasheet which you may find useful:

    Regards,

    Hooman