| Electronics > Beginners |
| Atmega, USB 3.0, USB 2.0, I2C - Noise? |
| (1/1) |
| Tantalum:
Hello I'm trying to design a PCB which will host a M.2 LTE Modem and antenna just behind. I need to avoid EMI as much as possible, but I don't have any scope to make measurements :'(. So I'm trying to follow the best practices. The board has the following IC and buses: - Atmega @8MHz with external oscillator - INA260 current/voltage sensors, I2C 100kbps - Temp/humidity SI7013 sensor, I2C 100kbps - IMU, I2C 100kbps - LTC4367 overvoltage protection IC with charge-pump (400kHz???) to drive the Mosfet - USB 3 + USB 2 Mux (2.5GHz and 48MHz) - SIM Card MUX (1-4MHz) - 1-Wire bus So, my questions? - Would it be a good idea to use a tin shield can over that stuff? Or would the tin can harm the performances of the LTE antenna located just behind (800-2600MHz)??? - Is it useful to add a ferrite bead on the Vcc line of the ICs, to avoid escaping of high frequency noise? Thank you |
| WildMOSFET:
I think a minimum of shielding is necessary, leaving the area near the antenna free. Ferrites are good for blocking electromagnetic disturbances, they are commonly used. Also insert a nearby ceramic or polyester capacitor on the circuit supply line. |
| Navigation |
| Message Index |