1. The PCB layout board touches the problem, and when the imitation signal is traced, the imitation signal is not wrapped with imitation, and there is even a possibility that the signal line is directly taken to the power line, which is easy to receive disturbance.
Solution: When it is a board, wrap the GND to imitate the signal line. If there is an analog GND and a digital GND, a separate connection is required and cascaded using a 0 ohm resistor.
2. Principle planning problems. The text wave of the power supply system of the acquisition chip that imitates the signal is too large, the filter circuit is not reasonable, the blocking circuit is not in place, and the filter circuit is not close to the equipment.
Solution: Ensure that the power supply voltage is wave, and the filter circuit needs to be close to the chip or sensor;
3. The problem of equipment layout, if there is a corresponding wireless module such as 2G/4G/Wifi/nbio/zigbee and other communication modules, if the layout position is unreasonable during planning, the wireless signal emitted by it will have a large amount of imitation, and perhaps the radiation will have an impact on the power supply system of the single-chip microcomputer and the level of the reset circuit. Present undesirable phenomena such as restart, shutdown, and crash.
Solution: If the antenna is an on-board antenna, the antenna perimeter needs to be hollowed out, the direction of radiation should be outward, the sensor and the transmission module should be placed separately, and the conditional sensor can be installed with a shield.
Several areas where disturbance control is severe
1. In the medical profession, in order to be able to collect various parameters of the human body, a lot of sensors will be used, and many parameters of the human body are very small, so the signal needs to be expanded, such as fetal heart rate monitor, ECG monitor, if in the circuit planning, the source of text wave disturbance is too large, then the normal waveform and assignment can not be obtained, and the project will fail directly.
2. Instrumentation profession, our commonly used multimeter, oscilloscope, will need to measure all kinds of external digital imitation amount, originally used to measure external signal sources, often need to measure uA level current and mA voltage, if the wave is too large, covering the normal type, the function will plummet. In many cases, the demand is not available.
There are many, many more such applications, and I won't give examples here.
There are various causes of signal disturbance, which vary depending on the project, so when planning the schematic and PCB sketchboard, it is necessary to consider the power, filtering, radiation, layout, power frequency and other factors. Rational planning.
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