Mobile wireless communications device having improved RF immunity of audio transducers to electromagnetic interference (EMI)
First Claim
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1. A mobile wireless communications device comprising:
- a housing;
a plurality of circuit boards carried by the housing and including radio frequency (RF) circuitry and a processor operative with each other and each carried by at least one of the circuit boards;
audio circuitry carried by at least one of the circuit boards and operative with the RF circuitry and processor;
an audio transducer assembly that includes a transducer housing and carried by at least one of the circuit boards and having an electrical contact pad member that electrically engages the audio circuitry for carrying audio signals between the audio circuitry and the audio transducer assembly wherein the audio circuitry engaging the electrical contact pad member comprises uninterrupted signal traces on at least one of the circuit boards; and
a first filter serially connected within each uninterrupted signal trace of the audio circuitry at the audio transducer assembly, and further comprising at least one of a second filter mounted serially at the electrical contact pad member and a third filter mounted within the transducer housing of the audio transducer assembly for reducing radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation.
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Abstract
A mobile wireless communications device includes a housing and circuit board carried by the housing and having radio frequency (RF) circuitry and a processor operative with each other. Audio circuitry is carried by the circuit board and an audio transducer assembly, such as a speaker, has electrical contacts that electrically engage the audio circuitry for carrying audio signals between the audio circuitry and audio transducer assembly. A filter is mounted at the audio transducer assembly and reduces radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation.
63 Citations
18 Claims
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1. A mobile wireless communications device comprising:
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a housing; a plurality of circuit boards carried by the housing and including radio frequency (RF) circuitry and a processor operative with each other and each carried by at least one of the circuit boards; audio circuitry carried by at least one of the circuit boards and operative with the RF circuitry and processor; an audio transducer assembly that includes a transducer housing and carried by at least one of the circuit boards and having an electrical contact pad member that electrically engages the audio circuitry for carrying audio signals between the audio circuitry and the audio transducer assembly wherein the audio circuitry engaging the electrical contact pad member comprises uninterrupted signal traces on at least one of the circuit boards; and a first filter serially connected within each uninterrupted signal trace of the audio circuitry at the audio transducer assembly, and further comprising at least one of a second filter mounted serially at the electrical contact pad member and a third filter mounted within the transducer housing of the audio transducer assembly for reducing radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of making a mobile wireless communications device, which comprises:
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providing a housing, a plurality of circuit boards carried by the housing and including radio frequency (RF) circuitry and a processor operative with each other and each carried by at least one of the circuit boards, audio circuitry carried by at least one of the circuit boards and operative with the RF circuitry and processor, and an audio transducer assembly that includes a transducer housing and carried by at least one of the circuit boards and having an electrical contact pad member that electrically engages the audio circuitry for carrying audio signals between the audio circuitry and the audio transducer assembly wherein the audio circuitry engaging the electrical contact pad member comprises uninterrupted signal traces on at least one of the circuit boards; and reducing radio frequency (RF) electromagnetic interference to the audio transducer assembly during device operation by serially connecting a first filter within each uninterrupted signal trace of the audio circuitry at the audio transducer assembly and mounting at least one of a second filter serially at the electrical contact pad member and a third filter within the transducer housing of the audio transducer assembly. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification