Patent ID: 8594611

Claim:
A portable radio device comprising: a portable radio device housing; a first intrinsically safe circuit (ISC) disposed within said housing and arranged to perform at least one function to facilitate operation of said portable radio device; at least a second ISC disposed within said housing and arranged to perform at least a second function to facilitate operation of said portable radio device; and a power distribution circuit disposed within said portable radio device housing and arranged to couple power from a power source to each of said first ISC and said second ISC; wherein said first ISC includes a first power limiting circuitry interposed between said power distribution circuit and a first functional circuitry for performing said first functions, and at least said second ISC includes a second power limiting circuitry interposed between said power distribution circuit and second functional circuitry for performing said second function; and wherein said first and second ISC each independently satisfy a defined standard for intrinsic safety selected from the group consisting of FM3610, IEC 60079-11 or ANSI/ISA 60079-11.