行业知识

Recycling 3 "black technologies" in mobile phone memory

Recycling the channel index of the phone memory ; when you mention the dual channel, the small partner who is familiar with the PC knowledge is definitely not calm, because the dual channel memory can completely release the performance of the integrated graphics card.  However, if the computer is equipped with a single display, the gain effect of the dual channel on performance is not obvious.  The same is true in the mobile phone field. The difference between dual-channel memory and single-channel memory can only be reflected in the running score, but the actual use process is difficult to feel the obvious difference.


By the way, the mobile phone field is now more than two channels. The concept of four channels has been introduced since the Qualcomm Snapdragon 835.  Although the multi-channel performance gain Buff may not be as high as expected, but in a hurry, the mosquito is small and the meat is psychological. We still welcome all mobile phones to use the four channels as soon as possible, just don’t take this selling point. The price is just fine.
 LPDDR4X is coming. Nowadays, low-end mobile phones are mostly based on LPDDR3 memory, and high-end new products have been upgraded to LPDDR4.  Compared with LPDDR3, LPDDR4 can achieve higher operating frequency, easily reach 1866MHz, and the operating voltage is reduced to 1.1V, which can increase the function and processing speed, but can bring 40% of power saving.
 The latest LPDDR4X is a transitional technology before LPDDR5. Its theoretical maximum bandwidth can be increased from 3,732 Mbps to 4,266 Mbps for LPDDR4, and the operating voltage can be as low as 0.6V.  As with the number of channels, the performance gains of memory specifications and frequencies are limited, far less obvious than the increase in CPU clock speed.


 PoP makes the memory stack of the mobile phone very small, and its internal space can be described as gold.  In order to save more space to install a larger battery, PoP (PackageonPackage, also known as MissionaryPositionPackageonPackage), translated is the component stack assembly technology.
 The biggest feature of recycling mobile phone memory is to support PoP, so it has the opportunity to be packaged (stacked) with the processor chip.  There are two advantages to this. The first is that the two components are combined into one, which reduces the space occupied on the board, allowing the board to be reduced, and making room for the battery.
 The second is that the processor needs to access the memory frequently through metal leads. Stacking can minimize the length of the leads, thus reducing line noise, access delay, and power loss.
 Most mobile phones today use PoP, which allows the processor and memory chips to play the game of the pyramids, and most of them are under the processor and memory.
 In theory, the PoP-packaged memory and processor chip can be used to blow the intermediate tins together with a heat gun, and then separate them with tweezers.


 Looking at the hardware innovation of the mobile phone from the memory, I don’t know if you have noticed a problem. Although the memory capacity of the mobile phone is getting bigger and bigger, the 8GB memory mobile phone will be on the market next year, but the mobile phone memory capacity has not become too obvious. Power consumption problem.  The reason is that from LPDDR3 to LPDDR4, the memory working voltage is reduced and it has a significant power saving effect.
 In fact, the future direction of mobile phone memory is not to significantly improve performance, but to maintain the performance stability, reduce the voltage as much as possible to save valuable power.  The LPDDR4 voltage is reduced as such, as is the PoP package.  In addition to memory, the phone's storage unit from eMMC to UFS, screen from LCD to OLED (this is the most power-consuming), processor process upgrades, the purpose is also to balance performance and power consumption.

 

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