SD card filter and mobile phone
A filter and filter circuit technology, applied in the field of information electronics, can solve the problems of energy radiation outward, affecting the operation of surrounding equipment, affecting the normal operation of surrounding equipment, etc., to reduce space, improve driving ability, and good anti-interference effect Effect
Active Publication Date: 2015-06-10
盐城顺禹通信息技术有限公司
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Problems solved by technology
High-speed data access will generate electromagnetic fields and radiate energy outward, affecting the normal operation of peripheral equipment
[0004] At present, in order to solve the above problems, the prior art method is to set a metal shield outside the SD card to surround the SD card to prevent the interference electromagnetic field from spreading outward and affecting the normal operation of peripheral equipment.
[0005] However, the SD card needs to be connected to the circuit, and the SD card cannot be completely surrounded by a metal shield. Therefore, there will still be energy radiating outward, which will affect the normal operation of the surrounding equipment.
Method used
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[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] refer to figure 1 It is a structural schematic diagram of the first embodiment of the SD card filter of the present invention. Such as figure 1 As shown, the SD card filter in this embodiment has two filter circuits, specifically including first to fourth pins A to D, a first filter 101, a second filter 102 and a pull-up circuit Rp.
[0021] The first pin A is used to connect with a constant voltage source (not shown), meanwhile, the first pin A is also connected to one end of the first filter 101, and the other end of the first filter 101 is connected to the second pin B Connect, wherein, the second pin B can be connected with the VDD port of the SD card when the SD card is inserted into the SD card slot.
[0022] The third pin C is connected to one end of the second filter 102, and the other end of the second filter 102 is connected to the...
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The invention discloses an SD (Secure Digital) card filter. The SD card filter is connected with an SD card slot and comprises a first pin, a second pin, at least a third pin, at least a fourth pin and a plurality of filter circuits, wherein the first pin is externally connected with a constant voltage source; the second pin is connected with the VDD port of an SD card when the SD card is inserted into the SD card slot; the fourth pin is connected with the predetermined port of the SD card when the SD card is inserted into the SD card slot; all the filter circuits are arranged between the first pin and the second pin, as well as between the third pin and the fourth pin; and a pull-up resistor is further arranged between the first pin and the third pin. Through the above disclosed content, the technical scheme provided by the invention omits the step of arranging a special pull-up resistor on an external circuit, so that the space of a PCB is effectively reduced, and the SD card driving capability is greatly improved.
Description
technical field [0001] The invention relates to the technical field of information electronics, in particular to an SD card filter and a mobile phone. Background technique [0002] SD card, also known as Secure Digital Card, is a memory device based on semiconductor flash memory, which is widely used in portable devices, such as digital cameras, personal digital assistants (PDAs) and multimedia players. Common SD cards on the market generally include 8 channels, including: DAT0~DAT3 terminals, CLK terminal, CMD terminal, DET terminal, and VDD terminal. [0003] With the rapid development of technology, the access rate of SD card is getting faster and faster, up to 50MHz or more. High-speed data access will generate electromagnetic fields and radiate energy outward, affecting the normal operation of peripheral equipment. [0004] At present, in order to solve the above-mentioned problems, the method in the prior art is to set a metal shield outside the SD card to surround t...
Claims
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IPC IPC(8): H03H11/04H04M1/725
Inventor 王柯顾建良
Owner 盐城顺禹通信息技术有限公司