Anti-interference mobile phone microphone

Abstract

The invention discloses an anti-interference mobile phone microphone. The anti-interference mobile phone microphone comprises a metal shell, wherein an ECM, a triode, a first resistor, a second resistor and a third resistor are arranged in the metal shell, a first capacitor is arranged outside the metal shell, and a grounding terminal is arranged on the metal shell; the base electrode of the triode is grounded through the ECM, the collector electrode of the triode is connected with a VCC power supply end and one end of the second resistor through the first resistor, and the other end of the second resistor is connected with a Vs power supply end and is also connected with the output end of the mobile phone microphone through the first capacitor; the emitting electrode of the triode is grounded through the third resistor, and the grounding terminal is connected to the ground where a mobile phone mainboard is located; the ECM and the metal shell are not located on the same ground. According to the anti-interference mobile phone microphone, due to the fact that the metal shell of the microphone is connected to the ground where the mobile phone mainboard is located, breakover between the ground where the metal shell is located and the ground where a microphone circuit is located is avoided, and a good shielding effect is achieved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an anti-jamming mobile phone microphone. Background technique [0002] At present, it is more and more common for mobile phones to use mono pole antennas (single-polarized antennas), and generally the mono pole antenna and the microphone are set at the bottom of the mobile phone, so that the microphone is easily interfered by the radio frequency noise radiated by the antenna. This interference is commonly known as Current sound. [0003] see figure 1 , the traditional microphone includes a metal shell 100, a field effect transistor Q is arranged in the metal shell 100, the gate G of the field effect transistor Q is grounded through an EMC module (Electromagnetic Compatibility, electromagnetic compatibility), and the drain D is grounded through a The capacitor C is connected to its output port, and the source S of the field effect transistor Q is directly grounded. The me...

AI Technical Summary

Problems solved by technology

If the opening of the microphone faces directly outward, the inside of the microphone and the inside of the phone are easily damaged by static electricity

Moreover, traditional microphones use simple filter capacitors to filter out clutter, and the filtering effect is not ideal.

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