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