My principle diagram, transport is by stm32dac input and output to a AD chip ad7689, in the absence of input op-amp output waveform is not normal, can you tell me what's the problem

CodePudding user response:

Measuring op-amp + input waveform, whether for a quarter of the output waveform amplitude,

CodePudding user response:

Very stable noise,
May be produced by other parts of the circuit on the board,

CodePudding user response:

Larger may be, board used DCDC switching power, in the periodic current produced by the voltage on the GND copper wire, the op-amp grounding and MCU without handle,