Amplifying and offsetting

Hello I am quite new to the Opamp business, so bare with me.

1 I am getting a -10 to 10V signal over a BNC connector 50 ohm.

2 Then I would like to use a voltage follower followed by a voltage divider to reduce the signal to -1.5 to 1.5V.

so far so good.

3 After this I would like to offset the voltage signal with a Reference of 1.5V.

I have read that using a voltage divider and a inverting opamp causes a new thevenin voltage that reduces my amplification. would it be advisable to use another Voltage follower to prevent this? just to seperate the gain and the offset circuit?

for Opamps I would like to use the AD711

Parents
  • BP,

      You could use a restive divider to get down to +/-1.5V, go into one side of an InAmp, such as the

    AD8422 with a gain of one running on +/-5V, and then put 1.5V on the REF pin.

    If you want to continue w/ an op amp solution, the AD711 is verrrrrrry oooooold, so I would

    look at the ADA4177-1.

    Harry

Reply
  • BP,

      You could use a restive divider to get down to +/-1.5V, go into one side of an InAmp, such as the

    AD8422 with a gain of one running on +/-5V, and then put 1.5V on the REF pin.

    If you want to continue w/ an op amp solution, the AD711 is verrrrrrry oooooold, so I would

    look at the ADA4177-1.

    Harry

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