5 Replies Latest reply on Mar 5, 2020 4:31 AM by LePo_1062026

    Programmable Gain Amplifier with Vdda/2 as reference

      I've come across a perplexing problem. I have a CY8CKIT-059 and using PSOC Creator 4.3. I have a Programmable Gain Amplifier (PGA) with a gain of 2, and the reference set to external, and attached to a Vref component. With the Vref component set to Vdda/2, the reference voltage will actually change when I change the input voltage to the PGA. When the input votlage is zero, the voltage from the VREF component will read 1.4 V, and it increases tp 3.4 V when the PGA input is near 5V. This does not happen with any of the other reference voltage options (1.024 V, Vdda etc). Does anyone have any insights into this problem?