Circuit and method capable of lowering loop noise of active earphone

Abstract

The invention provides a circuit capable of lowering loop noise of an active earphone. The circuit comprises an integrated circuit module and a power module which are arranged on a PCB, a capacitor is further connected between the integrated circuit module and the power module, and the capacitor is arranged on one side of the integrated circuit module. The circuit further comprises a grounding wire which is arranged parallel to a power line, and the horizontal gap between the power line and the grounding wire is smaller than or equal to one half the sum of the width of the power line and the width of the grounding wire. One pole of the capacitor is electrically connected with a power pin of the integrated circuit module through the power line, the other pole of the capacitor is electrically connected with a ground pin of the integrated circuit module through the grounding wire, and the arrangement direction of the capacitor is consistent with the current direction of the power line. The invention further provides a method capable of lowering the loop noise of the active earphone. The capacitor is arranged in the direction of currents passing the power line, the distance between the power line and the grounding wire is shortened, and thus the current loop area is decreased to the maximal degree. According to the circuit and method, the cost is low, the efficiency is high and the applicability is wide.

Description

technical field [0001] The invention relates to the technical field of earphone noise reduction, in particular to a circuit and method for reducing loop noise of an active earphone. Background technique [0002] Active earphones, including wireless earphones with a transmitter device, have a structural feature that the loudspeaker and PCB circuit board used are all arranged in the ear shell. Due to the limited space in the ear shell, this limits the distance between the speaker and the PCB circuit board to be very close, and can only be adjusted within a small range. [0003] The integrated circuit module in the active earphone PCB circuit board in the prior art will inevitably form a noise source due to the fluctuation of the internal current during operation. Due to the close distance between the speaker and the PCB circuit board, these noise sources are likely to form a current loop in the power supply circuit, or form a noise current path with improperly set electronic ...

AI Technical Summary

Problems solved by technology

[0003] The integrated circuit module in the active earphone PCB circuit board in the prior art will inevitably form a noise source due to the fluctuation of the internal current during operation

Due to the close distance between the speaker and the PCB circuit board, these noise sources are likely to form a current loop in the power supply circuit, or form a noise current path with improperly set electronic devices, such as capacitors, etc., causing magnetic field radiation, and further affecting Loudspeakers generate magnetic interference and create loop noise

[0004] Based on the above analysis, the PCB circuit board used in the existing active earphones is prone to generate loop current, which causes loop noise in the speaker

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