Turning on the heater introduces a voltage spike and voltage swing on my 3.3V regulator and this causes a transimpedance amplifier output to be wrong.
Every time the heater turns on my 3.3V regulator voltage changes by +-5mV. Note: 12V and 5V regulator voltage also change.
Heater MCH2-80W-001 datasheet
I have tried all below methods but did get any improvement. I need be able to avoid the voltage swing as much as possible.
- Add MOV or varistor parallel to the heater
- Add inrush current limiter in series to the heater
- Add MOV and ICL
- Add diode in parallel to the heater
Below diagram is just for demonstration, actual circuit will have all bypass and require parts.
The following graph shows when the heater turns on and off (red circles.)