hello
I have been reading about diode detectors and two states, square law region and when it has the forward voltage. below the forward voltage the diode doesn't work well and something is required to make it more linear from one state to another. I think this is where op amp compensation comes in. I have read about compensation a little. most of what I find is a lot of math that does my head in. I know that an op amp can have internal (capacitor inside) compensation and external (capacitor outside) compensation. I think the 741 is internal. I don't know if this is what makes the diode detector linear I cant find anything about it. I think its a case of knowing what to look for.
any suggestions would be great!!!
I have cut this from a circuit im trying to research. I think the compensation is provided by C6 (10nF). I think D1 and C2, D2 and C4 provide full wave rectification. I think R6, R7, R10 and R11 provide a feedback system making the op amp stable. I don't know what R4, C3, R5, R8, C5 and R9 do?
I think maybe R8 and R4 provide some sort of loading and C5, C3 some sort of smoothing. actually looking at it R8 and R9 look like a voltage divider?
anyone know if this is right?
the first person to respond gets a free ferrarrarrarri in the post!!!
Christmas soon, WOOOOO!!!!!
thanks
simon
I have been reading about diode detectors and two states, square law region and when it has the forward voltage. below the forward voltage the diode doesn't work well and something is required to make it more linear from one state to another. I think this is where op amp compensation comes in. I have read about compensation a little. most of what I find is a lot of math that does my head in. I know that an op amp can have internal (capacitor inside) compensation and external (capacitor outside) compensation. I think the 741 is internal. I don't know if this is what makes the diode detector linear I cant find anything about it. I think its a case of knowing what to look for.
any suggestions would be great!!!
I have cut this from a circuit im trying to research. I think the compensation is provided by C6 (10nF). I think D1 and C2, D2 and C4 provide full wave rectification. I think R6, R7, R10 and R11 provide a feedback system making the op amp stable. I don't know what R4, C3, R5, R8, C5 and R9 do?
I think maybe R8 and R4 provide some sort of loading and C5, C3 some sort of smoothing. actually looking at it R8 and R9 look like a voltage divider?
anyone know if this is right?
the first person to respond gets a free ferrarrarrarri in the post!!!
Christmas soon, WOOOOO!!!!!
thanks
simon