The continuous escalation of the war in the 4G smartphone market has directly led to fierce competition in the upstream chip field. On the one hand, Qualcomm, Marvell and other international chip companies firmly occupy the 4G chip market, and the traditional giant Broadcom has withdrawn. On the other hand, with the multi-mode chip products such as HiSilicon, MediaTek, Spreadtrum, and Lianxin successively put into commercial use before the end of 2014, domestic chip manufacturers are rushing to catch up with the group, and the entire 4G chip market pattern will be in 2014. Change occurred during the middle of the year.
Competitive competition in industry reshuffle
The significant increase in costs from the development of 4G chips and the increasingly fierce market competition will further accelerate the industry's reshuffle.
With the increasing investment scale of mobile phone chips, the challenges faced by the mobile phone chip business are also growing. Recently, the traditional chip maker American Broadcom announced that it is awkward to abandon the mobile phone baseband chip business. According to the announcement issued by Broadcom, the cost-intensive mobile phone baseband chip business has smashed the company's performance.
The exit of Broadcom was not surprising. According to the industry, Broadcom is weak in the high-end mobile phone chip market due to the existence of Qualcomm, and is squeezed by MediaTek in the low-end market. Sheng Linghai, director of research at Gartner (China), believes that Broadcom’s mobile phone chip customers are further lost due to the “high and low†status of Broadcom. "The deterioration of the ecological environment of the baseband business has led to the deterioration of the living environment of Broadcom mobile phone chips, and has dragged down the overall profit rate of Broadcom. Therefore, it is reasonable for Broadcom to make such a decision." Sheng Linghai told the China Electronics News reporter.
The situation of Broadcom is also a problem faced by most mobile phone chip companies. Previously, Texas Instruments, a chip company, announced that it had withdrawn from the competitive mobile phone chip market due to the low gross profit margin. ADI Semiconductor Technology Co., Ltd. also sold the baseband chip business under the pressure of Wall Street a few years ago.
Wang Yanhui, secretary general of the China Mobile News, said in an interview with China Electronics News that the cost increase brought about by the research and development of 4G chips and the increasingly fierce market competition will further accelerate the reshuffle of the industry, and Broadcom is definitely not the last company to be out. .
Wang Yanhui believes that LTE baseband chip market is mainly based on Qualcomm and Marvell, but with the maturity of 4G multi-mode chip solutions of MediaTek, Spreadtrum, and Lianxin in the second half of the year, at least until the first half of next year, the mobile phone chip market will be Qualcomm. And the market pattern dominated by domestic chip makers such as MediaTek and Spreadtrum will not change much. In addition to Qualcomm, European and American companies may further withdraw from the market.
After the commercialization at the end of the year, MediaTek and Spreadtrum's solutions are more mature and easy to be promoted on a large scale. Once the 4G multi-mode chip technology problem is solved, the market capability and decision-making ability will be tested. Domestic manufacturers are more in this regard. There are advantages. In addition, for domestic manufacturers, 30% of the gross profit margin can be accepted, while European and American companies require at least 40% -45%, so in the fierce low-end market, European and American companies may even profit. Give up." Wang Yanhui said.
In the rectifier circuit; the use of diodes in series can increase the back pressure withstand value (usually the sum of the back pressure of all diodes, but it is best to use diodes of the same specification).
In the voltage stabilization circuit; the series connection of the diode is equal to the sum of the voltage stabilization value of the diode. The use of diodes in parallel is theoretically the sum of rated currents, but considering that it is impossible to be absolutely symmetrical, they can only be used below 80% of the total.
TVS transient suppressor diodes work in the same way as regulator diodes, but there are structural differences.The biggest difference is that the PN junction area composed of the general regulator diode is very small, it can withstand the reverse current is small.
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