Skyworks PK3101B01 Power Amplifier Die (SKY520) Circuit Report

CircuitVision analyzes Skyworks’ PK3101B01 RF PA die from the SKY5 20 FEM, detailing RF signal paths and biasing from an iPhone 17 Pro Max.

The following is a CircuitVision Analysis report on the Skyworks PK3101B01 RF Power Amplifier die, found in the Skyworks SKY5 20 2.4 GHz WiFi/BT FEM. The SKY5 20 multi-chip module contains a power amplifier (PA) die and a low-noise amplifier (LNA) die. The focus of this analysis is the PK3101B01 PA die, in particular, the RF signal path and biasing. The SKY5 20 is found in multiple Apple handsets, as outlined in the device genealogy. The component used in this analysis was taken from the Apple iPhone 17 Pro Max (A3257) from the US. Details of the RF paths within the phone can be found in the Mobile RF Architecture and deep dive teardown reports available on the TechInsights Platform. The following report contains a full set of schematics and annotated photographs delivered in a CircuitVision format.