Analogue Voltage input if using OpAmp buffer to SAR

Onethinx LoRaWAN Core
1

Ive been trying to estimate if I will need to include a high-input impedance opamp in my design if I need >10Mohm input impedance?

2

That’s where PSoC configurability comes in. You don’t need external OpAmps to do the task. You can configure the internal OpAmp as a voltage follower (or an amplifier if this suits better).

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See: CE220927 – PSoC 6 MCU OpAmp and Comparator Example

4

Thanks Rolf. It appears that the non-inverting opamp presents an infinite input impedance because it draws no current from the source. This is exactly what I needed.