Which EMC (electromagnetic compatibility) devices are helpful for the design and modification of dynamic electrocardiogram (ECG) recorders?

To enhance the Holter's anti-interference capabilities, meticulous EMC design is required within a limited space. The ECG signal input is of paramount importance; it is recommended to use a composite ESD/filter device specifically designed for bioelectrical signals, or a combination of ESD protection diodes (e.g., ESD5V0D3) and an RC filter network to provide electrostatic protection while suppressing high-frequency common-mode noise. For the device's small switching power supply module, small-package ferrite beads (PBZ1005 series) can be added to its input and output terminals. Decoupling capacitors and low-power TVS diodes (e.g., SMF3.3) should be placed nearby on the internal crystal oscillator and digital circuit power pins. Ferrite beads should be connected in series on the Bluetooth module's power line, and ESD protection devices can be configured at the antenna port to ensure stable wireless communication.