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CC2538: Received Frame on the frequency 20MH-150MHz off from the target frequency center

Part Number: CC2538


Hi I have a board with TI CC2538. Current we have designed a IEEE802.15.4 compilant chip which is able to talk through 2.1-2.6GHz frequency range. When we trying to send frame under those frequency in the range, CC2538, which was configured on only listen on one of the IEEE802.15.4 channe, is able to receive some frames on other frequency with 20MHz -150MHz offset. Though, the RSSI of frames received on unexpected frequency is lower than the frames received on the right frequency.

Could someone explain what could cause this? Thanks!

Tengfei