Dual input single output power multiplexer for near field communication application

摘要

Generally, this disclosure provides systems, methods and platforms for power multiplexer switching operations. The system may include a near field communication (NFC) module configured to receive power through a radio frequency (RF) channel; a subscriber identity module (SIM) circuit configured with a supply voltage port; and a power multiplexer circuit configured to controllably couple the SIM circuit supply voltage port to the NFC module, wherein the NFC module provides a supply voltage to the SIM circuit such that the SIM circuit is operable in the absence of primary device power source.

主权项

1. A system, comprising:
a near field communication (NFC) module configured to receive power through a radio frequency (RF) channel; a primary power source; a subscriber identity module (SIM) circuit configured with a supply voltage port; and a power multiplexer circuit configured to controllably couple said SIM circuit supply voltage port to said NFC module or said primary power source, wherein said power multiplexer circuit includes control logic coupled to slew rate (SR) drivers that each control transistors configured to couple each of said NFC module and said primary power source to said SIM circuit supply voltage port, each of said transistors having true reverse current blocking circuitry to prevent current from flowing back from said SIM circuit supply voltage port to said NFC module and said primary power source.