Audio input switching circuit for TD-SCDMA/GSM dual-mode mobile phone
A TD-SCDMA, dual-mode mobile phone technology, applied in the field of TD-SCDMA/GSM dual-mode mobile phone audio input switching circuit, can solve the problems of voice signals being easily interfered, and achieve the effect of solving the problem of being easily interfered and reducing the difficulty
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[0018] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0019] figure 2 It is a schematic diagram of the TD-SCDMA / GSM dual-mode mobile phone audio input switching circuit of the present invention.
[0020] refer to figure 2 As shown, by adding an analog switch to the circuit, a microphone is shared in the dual-mode mobile phone.
[0021] In this embodiment, the TD-SCDMA / GSM dual-mode mobile phone system uses the GSM module as the main control module, and the TD-SCDMA module is the controlled module, so the port used to control the analog switch to switch the microphone audio input is located in the main control module GSM module On the side, that is, the baseband main chip general-purpose I / O port GPIO1 of the GSM module is connected to the 4th pin and the 8th pin of the control terminal of the analog switch. The microphone receiving end MIC IN and MIC GND of the GSM module are respectively con...
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