4 DC-OFFSETs

[JimB]

Having gone through all this soul searching looking for a means of adjusting the four voltages with one control, have you ever considered that the optimum carrier rejection is not achieved when the four voltages are all the same, but when they are slightly different due to the tolerance of the other components in the circuit?

I suspect this is why the original designer of the circuit used four controls.

JimB

 

[dr.power]

Having gone through all this soul searching looking for a means of adjusting the four voltages with one control, have you ever considered that the optimum carrier rejection is not achieved when the four voltages are all the same, but when they are slightly different due to the tolerance of the other components in the circuit?

I suspect this is why the original designer of the circuit used four controls.

JimB

Actually my purpose is to have SSB-WC not SSB-SC, It means that I need DC offsets.
The purpose of having the all DC voltages the same at a constant Dc point is to have the carrier at the output of the modulator too.

 

[MrAl]

Hi again,

Well ok then it sounds like you can use the two op amps i drew previously, only you dont need the resistors shown there too. You just need the resistors shown on your schematic. So you need two op amp sections and four resistors, and of course the pot and any limiting resistors you care to use on the pot so you get fine adjustment control.

 

[dr.power]

Hi again,

Well ok then it sounds like you can use the two op amps i drew previously, only you dont need the resistors shown there too. You just need the resistors shown on your schematic. So you need two op amp sections and four resistors, and of course the pot and any limiting resistors you care to use on the pot so you get fine adjustment control.

Sorry But can you please kindly DRAW your mean for FOUR dc offsets?