hi experts
i saw the Input voltage range spec in our datasheet--MIN input voltage is (V-)-0.1V. if OPA991 is used in Single-Supply situation, such as (V-) is 0V, GND.
in this situation, whether i can use Inverting amplifier circuit to zoom in negative input signal(-0.1V~0V) to output positive signal? There is no requirement for output accuracy.
could you simulate this situation and share your comments?
thanks.
Hello Jay,
The OPA991 can work in an inverting op-amp configuration to give a positive output. I have attached a simple TINA-TI simulation to demonstrate this. This configuration has a gain of -1.8(-Rf/Rin) with it's output swinging close to the 5V rail, and I added a DC source on the non-inverting terminal to compensate the Vos on the input terminal.
Once you load this .TSC file. enter ctrl+alt+t to get this transient response.
Regards,
Ore.
disclaimer: TI is not responsible for customer design, all design decisions are up to the customer to make.
