Mobile wireless communications device with reduced interfering energy into audio circuit and related methods
A mobile wireless communications device includes a housing and circuit board carried by the housing. RF circuitry and a processor are operative with each other and carried by the circuit board. A receiver speaker and microphone are carried by the housing. Audio circuitry is carried by the circuit board and operative with the RF circuitry and processor. A microphone audio switch and receiver speaker audio switch are carried by the circuit board and are connected with audio connection lines that interconnect the processor. A filter is operative with 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.
1. An electronic device comprising:
an audio input device;
an audio output device;
a processor;
at least one wireless transceiver coupled to said processor;
audio connection lines;
a first audio switch coupled to said audio output device and said processor via said audio connection lines;
a second audio switch coupled to said audio input device and said processor via said audio connection lines;
a jack and associated jack connection lines coupled to said processor and at least one of said first and second audio switches; and
at least one interference filter coupled to said audio connection lines.
2. The electronic device according to claim 1 , wherein said first and second audio switches each includes a respective detect circuit for detecting when a respective audio input/output device is coupled to said audio connection lines.
3. The electronic device according to claim 1 , and further comprising at least one jack filter coupled to said jack connection lines.
4. The electronic device according to claim 3 , wherein said at least one jack filter includes a resistor divider.
5. The electronic device according to claim 1 , further comprising at least one inductor operatively connected between said jack and at least one of said first and second audio switches.
6. The electronic device according to claim 1 , further comprising audio test terminals coupled to said processor for conducting an audio breakthrough test.
7. The electronic device according to claim 1 , wherein said at least one interference filter comprises at least one inductor.
8. The electronic device according to claim 1 , wherein said at least one interference filter comprises at least one ferrite inductor.
9. The electronic device according to claim 1 , further comprising a handheld housing carrying said audio input and output devices, processor, audio connection lines, first and second audio switches, and interference filter.
10. The electronic device according to claim 1 , further comprising cellular radio frequency circuitry coupled to said processor.
11. An electronic device comprising:
an audio output device;
a processor;
at least one wireless transceiver coupled to said processor;
audio connection lines;
an audio switch coupled to said audio output device and said processor via said audio connection lines;
a jack and associated jack connection lines coupled to said processor and said audio switch; and
at least one interference filter coupled to said audio connection lines.
12. The electronic device according to claim 11 , wherein said audio switch includes a detect circuit for detecting when a microphone/headset is coupled to said audio connection lines.
13. The electronic device according to claim 11 , further comprising at least one jack filter coupled to said jack connection lines.
14. The electronic device according to claim 13 , wherein said at least one jack filter includes a resistor divider.
15. The electronic device according to claim 11 , further comprising at least one inductor coupled between said jack and said audio switch.
16. The electronic device according to claim 11 , wherein said at least one interference filter comprises at least one inductor.
17. The electronic device according to claim 11 , wherein said at least one interference filter comprises at least one ferrite inductor.
18. An electronic device comprising:
an audio input device;
a processor;
at least one wireless transceiver coupled to said processor;
audio connection lines;
an audio switch coupled to said audio input device and said processor via said audio connection lines;
a jack and associated jack connection lines coupled to said processor and said audio switch; and
at least one interference filter coupled to said audio connection lines.
19. The electronic device according to claim 18 , wherein said audio switch includes a detect circuit for detecting when a microphone/headset is coupled to said audio connection lines.
20. The electronic device according to claim 18 , further comprising at least one jack filter coupled to said jack connection lines.
21. The electronic device according to claim 20 , wherein said at least one jack filter includes a resistor divider.
22. The electronic device according to claim 18 , further comprising at least one inductor coupled between said jack and said audio switch.
23. The electronic device according to claim 18 , wherein said at least one interference filter comprises at least one inductor.
24. The electronic device according to claim 18 , wherein said at least one interference filter comprises at least one ferrite inductor.