[muRata] EMC Solutions: Noise Suppression Examples

Noise Emission Status
Noise Suppression Model

Installing EMI filters on the Clock Line
Installing EMI filters on Oscillator Output
Installing EMI filters on Bus Lines
Installing EMI filters on the DC Power Supply Input and Lines
Installing EMI filters on Interface Cable Ports
Installing EMI filters on Signal Lines to the Handset
Installing EMI filters on Motor Signal Lines

Noise suppression of motor signal lines using the
BLM21AG601SN1 (Chip Ferrite Bead, 600 ohms at 100 MHz)

Before installing the EMI filter			Noise stemming from the motor driving IC is conducted to the signal lines and then emitted from the cable connecting the board and motor. To suppress noise conducted to the motor signal lines, the BLM21AG601SN1 (Chip Ferrite Bead, 600 ohms at 100 MHz) is installed on the motor signal lines. This suppresses the noise level by 3 to 5 dB.
After installing the EMI filter