Driven by the fierce competition among various brands, portable electronic products have diversified in their functions and become increasingly complex. Due to its small size, the product's operating frequency is getting higher and higher, and the operating voltage is getting smaller, the electromagnetic signals generated by the functional modules interfere with each other in a very small volume. On the other hand, with the increasing popularity of various electronic products (including commercial and industrial), for users of portable electronic products, the number density of electronic products in operation around the environment where they are located is getting higher and higher. The electromagnetic radiation interference generated by these electronic products is even more serious, making the electromagnetic interference (EMI) problem increasingly complicated.
The technical team of Amazing Microelectronic has accumulated a wealth of technology and experience in electrostatic discharge (ESD) protection technology. The company's electromagnetic interference filter products are mainly developed for portable electronic products to solve electromagnetic interference problems in hardware design and development. In order to effectively solve the problem of electromagnetic interference at the same time and take into account the function of electrostatic discharge protection, Jingyan Technology has successively launched several electromagnetic interference filters with electrostatic discharge protection. Which of these electromagnetic interference filter products belong to? Type (pi-model) low-pass filter (LPF). Since electromagnetic interference filters are mostly used in the input and output ports of electronic products, the capacitance of the input and output terminals to ground (GND or VSS) in the filter architecture is generally an electrostatic discharge protection element using a transient voltage suppressor (TVS) , To take into account the high standard of electrostatic discharge protection. In this way, in addition to providing a good low-pass filtering effect, it also has a very good electrostatic discharge protection effect.
Mobile phones are one of the most popular portable electronic products in recent years. In every mobile phone, there must be at least one SIM (Subscriber Identity Module) card for user identification and storage of data. In the new smart phones, no matter what kind of mobile phone brand, most of them have MMC (multimedia card) / SD (secure digital storage) cards for storing photos, phone books, e-mail or short messages. use.
Under normal use, when the SIM card or MMC / SD card of the mobile phone transmits data, when the double-frequency harmonic radiation signal of the basic frequency of the transmission signal (referred to as the fundamental frequency) appears in the mobile phone's communication band, it will Causes a certain degree of interference in mobile phone radio frequency communication signals.
Conversely, the radiation generated by mobile phone radio frequency communication signals will also be coupled to the data transmission signal of the SIM card or MMC / SD card, causing distortion of the signal waveform. If it is serious, it will cause errors in data transmission.
For the two applications of SIM card and MMC / SD card, Jingyan Technology provides corresponding electromagnetic interference filters AZM-SIM01-03F and AZM-MMC01-06F, which can solve the above electromagnetic interference problems. Table 1 shows the basic characteristic parameter values ​​of Jingyan Technology's AZM-SIM01-03F and AZM-MMC01-06F electromagnetic interference filter products. These two kinds of electromagnetic interference filters are suitable for the rated voltage circuit system of 5V or below, the line capacitance value is 22pF and 24.5pF respectively. When the operating frequency is 1GHz, the insertion loss can reach -20dB and -21.5dB The electromagnetic interference signal strength is significantly reduced to below one-tenth to maintain the normal operation of the protected circuit.
Table 1: The basic characteristic parameters of the electromagnetic interference filter applied to the SIM card and MMC / SD card by Jingyan Technology.
In terms of electrostatic discharge protection, the transient voltage suppressors in this series have extremely low clamping voltages. The antistatic protection effect of AZM-MMC01-06F can be as high as 10kV or more (IEC 61000-4-2, contact mode ± 10kV), and the antistatic protection effect of AZM-SIM01-03F can be as high as 15kV (IEC61000-4-2, contact mode ± 15kV).
When an electrostatic discharge event (ESD) occurs, the lower the clamping voltage of the transient voltage suppressor, the more immediately the considerable electrostatic discharge current can be turned on to protect the protected circuit from electrostatic discharge Loss effect. Figure 1 shows the clamping voltage diagram of the AZM-SIM01-03F and AZM-MMC01-06F products measured by the transmission line pulse generation system (TLP). It can be clearly seen from the figure that the clamping voltage of these two electromagnetic interference filters under the high electrostatic discharge current of 17A output from the transmission line contact wave generation system is less than 8.5V, which can effectively provide a fast circuit for the protected circuit Effective bypass path for electrostatic discharge.
Figure 1: AZM-SIM01-03F and AZM-MMC01-06F electromagnetic interference filters launched by Jingyan Technology: The clamping voltage corresponding to 17A is less than 8.5V.
In addition, according to the specifications established by the IEC 61000-4-2 standard, the fourth level of protection needs to provide at least contact discharge mode (contact discharge mode) 8kV, air discharge mode (air discharge mode) 15kV or more electrostatic discharge protection capability. This series of products provide electrostatic discharge protection capability of more than 10kV in contact discharge mode, which clearly exceeds the demand value specified in the fourth level of the IEC 61000-4-2 standard.
Since portable devices need to rely on batteries to supply the required power, the larger the leakage current during normal use of the components, the greater the power consumption of the battery and the shorter the power supply time. Figure 2 shows the current-voltage (IV) characteristic curve of the new AZM-SIM01-03F and AZM-MMC01-06F electromagnetic interference filter products launched by Jingyan Technology. It can be seen from the curve in the figure that the leakage current of the new electromagnetic interference filter products at the applicable system operating voltage (here 5V or below) is far less than 1uA, so the battery can last longer for portable devices.
Figure 2: AZM-SIM01-03F and AZM-MMC01-06F electromagnetic interference filter products launched by Jingyan Technology: The DC leakage current value measured by the I / O end to ground (GND or VSS) is much less than 1uA.
In terms of packaging, this series of products of Jingyan Technology adopts a rectangular flat leadless package (DFN) with a lead pitch of 0.4mm. Therefore, in the system design, the circuit board area occupied by the electromagnetic interference filter components can be effectively reduced, which is convenient for the design of other circuit components, and can be easily reworked (surface mount) ), It is not easy to cause component damage.
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