Probably there are no separate "chips", but functionality built in into the same integrated circuit as CPU and other things (SoC). The reason to include it into

Probably there are no separate "chips", but functionality built in into the same integrated circuit as CPU and other things (SoC). The reason to include it into SoC is that the same SoC is used in various devices, not only phones, and it's not so complicated thing, just heterodyne and ADC. Mainstream media loves the word "chip" and uses it in any context they like.