The input voltage on the ADC rises

The input voltage on the ADC rises at about 0.3-0.4В when sending or receiving SMS/voice.

What can be the reason?

Thanks.

Hi,

Which module you are using?

Thanks.

Power supply issue :question:

Module is Q64

Power supply: external power source 3.6V

https://forum.sierrawireless.com/t/faq-forum-wiki/3491/1