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Unipolar to Bipolar Conversion.

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V

viks

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Hi guys

I need to convert a sine wave signal 0 - 3V into -9 to +9 sine wave.
I think I need to use Opamp but I am not able to figure out circuit.

How can I do it?
 

right now 2 ideas come to my mind.........

design a non-inverting amplifier with gain 6 and

1.connect a 1.5V supply in series with the input
(or)
2. shift the ground by using a 9V supply instead of ground in the resistor connected to the inverting input side.....
 

    V

    viks

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viks , if you don't mind transients - decouple AC by capacitor , or in other case do as Anand suggested.
If 3V bias is sweeping , you will additional DC compensation circuit.
 

    V

    viks

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try clamping it down using a diode and cap. so that you get -0.75 to 0.75. now provide a non-inverting gain of 9/0.75. hope this will work.
 

    V

    viks

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if u would use a diode and cap then we would need a suitable supply to compensate the effect of diode drop and the temperature variation of the diodes parameters.......
 

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