psoc5 ohm measure | Cypress Semiconductor
psoc5 ohm measure
First, can the Vref connect to the pin(out) directly without opamp? Because when with opamp, the supply voltage is less than Vref.
Then, the amplifier(PGA) was not good while input voltage is low. (I found it's good while Vin is more than 0.2V, but Vout cannot be more than 3.9V) Huge error happened when again is 50, but I was supposed to build a gain of 500.
The follow is my design. Thx for help.