Let's say I have a voltage generator that generates a voltage called V1. I want to produce an output, Vout where Vout = V1 + V2.
I want V2 to be some sort of voltage DAC, that is process and temperature independent. Could you please give some circuit solutions, and the pros/cons of each?
I think you can add the current. Vout=(I1+I2)*Ro
And the current can be generated by the limiter.
So I1=V1/R1, I2=V2/R2.
Then you should match R1, R2 and Ro.
That will be ok.
Thanks. Could you please show how I can make a PVT independent voltage DAC to generate V2? Also, how can I make Vo positive (remove the negative sign) ?
You can use a bandgap circuit to get a PVT independent voltage.
You can use a basic inverting opamp configuration to get Vout=-Vin.
Ps, DAC means digital to analog conversion, but r u using this?
jiesteve said:
Thanks. Could you please show how I can make a PVT independent voltage DAC to generate V2? Also, how can I make Vo positive (remove the negative sign) ?
the rail is relative, in other words, you can connect the input of the opamp to 0.5 Vcc, then it's OK to assume that the opamp uses "negative rail" of 0.