Patent ID: 7444174

Claim:
A mobile wireless communications device comprising: a housing; a circuit board carried by the housing and including radio frequency (RF) circuitry and a processor carried by the circuit board and operative with each other; a receiver speaker and a microphone carried by the housing; audio circuitry carried by the circuit board and operative with the RF circuitry and processor and including a microphone audio switch and a receiver speaker audio switch and audio connection lines formed as planar signal traces on the circuit board and interconnecting the processor and audio switches and operatively connected to said receiver speaker and microphone; and a filter formed as a ferrite inductor directly on the signal traces forming the audio connection lines and operatively connected to at least one of the microphone audio switch or receiver speaker audio switch to reduce conducted and radiated interfering RF energy from coupling into the audio circuitry, wherein said audio circuit further comprises a jack carried by the housing, and jack connection lines carried by said circuit board and operatively connected to said jack and processor and to at least one of said microphone audio switch and receiver speaker audio switch, and a jack filter and resistor divider operative with the jack connection lines, for imparting a predetermined bias.