To supply op-amp 1, I need a power supply voltage of +2.5V and -2.5V. To supply op-amp 2, I need a power supply voltage of +4V and -1V. The outgoing signal from the op-amp stage will be fed into an ADC, so the rails have to be stable. I thought about using a DC to DC converter, but I could not find one with a positive and negative output voltage.
- How can I convert a 5V source to a bipolar voltage source?
I have this recommended circuit from Texas Instruments, where THS4509 is op-amp 2. They recommend a supply voltage of +4V and -1V to set Vcm as 1.5V.
Image source: Texas Instruments ADS612x 12-Bit ADC family datasheet
My signal source (Vs) will be op-amp 1, the output signal from op-amp 1 can be between +1V and -1V.
- By the way, what do I need for the resistors Rs and Rt?