Mobile terminal and its fm anti-jamming circuit
A mobile terminal and circuit technology, applied in the electronic field, can solve problems such as occupancy and large layout space, and achieve the effect of solving frequency band mutual interference and realizing circuit layout
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Embodiment 1
[0028] This embodiment provides an FM anti-jamming circuit for a mobile terminal. The mobile terminal includes an earphone socket 1, an FM chip 2, an FM antenna and a GSM antenna. The mobile terminal is suitable for a GSM network.
[0029] Such as figure 1 As shown, the FM anti-jamming circuit includes: LC filter circuit 3 and π-type filter 4 . The ground end of the earphone holder is electrically connected to the FM chip through the LC filter circuit and the π-type filter in turn.
[0030] The anti-jamming circuit of this embodiment includes a two-stage filter circuit, and the anti-jamming circuit solves the problem of mutual interference between the FM antenna and the GSM antenna frequency band, and the distance between the circuit and the GSM antenna is not limited. The circuit layout can be realized in the antenna space.
Embodiment 2
[0032] On the basis of Example 1, such as figure 2 As shown, the LC filter circuit 3 of this embodiment includes: a first inductor L1 and a first capacitor C1; one end of the first inductor L1 is electrically connected to the ground terminal of the earphone socket, and the other end of the first inductor L1 is connected to the first capacitor C1 One end of the first capacitor C1 is electrically connected, and the other end of the first capacitor C1 is grounded. Wherein, the capacitance of the first capacitor is less than or equal to 1nf.
[0033] The LC filter circuit can effectively isolate the interference of the FM antenna to the GSM antenna. When the ratio of the frequency of the LC filter circuit to the GSM operating frequency of the mobile terminal is 1 / 2, the effect is the best. That is, if the GSM operating frequency is 850MHz, the frequency of the LC filter circuit is more suitable at 425MHz. According to the frequency calculation formula of the LC filter circuit f=...
Embodiment 3
[0040] The present invention provides a mobile terminal, which can have figure 1 or figure 2 The FM anti-jamming circuit shown.
[0041] The mobile terminal can be a terminal device including a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales, a sales terminal), a vehicle-mounted computer, and the mobile terminal is an example of a mobile phone. image 3 Shown is a block diagram of a partial structure of a mobile phone 300 related to the mobile terminal provided by the embodiment of the present invention. refer to image 3 , mobile phone 300 comprises RF (Radio Frequency, radio frequency) circuit 310, memory 320, input unit 330, display unit 340, sensor 350, audio frequency circuit 360, WiFi (wireless fidelity, wireless fidelity) module 370, processor 380, and power supply 390 and other components. Those skilled in the art can understand that, image 3 The structure of the mobile phone shown in the above is only an example of the...
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