Overview: 1. Envelope tracking technology In short, it is the technology that establishes the connection between the working voltage of the power amplifier and the input RF signal to make them follow each other in real time, thereby improving the working efficiency of the power amplifier. According to theoretical calculation, the battery is relatively directly used. The power supply method, which can help the system save 65% of power consumption, will be supported by SuPA's next-generation products. Its basic principle is: the RF processing unit and the baseband processing unit calculate the envelope signal (Envelop signal) according to the RF signal, the power level and the power characteristic parameters of the power amplifier, and the differential DAC in the RF and baseband unit provides an analog reference signal. The ET power supply (ETPS) amplifies the envelope signal and sends it to the PA. At this time, the PA amplifies the RF signal so that the RF signal and the operating voltage of the PA follow. Finally, the amplifier sends the amplified signal to the duplexer. The duplexer attenuates the signal outside the bandwidth and highlights the useful signal. 2. Average power tracking technology This method is also called adaptive voltage adjustment (Adaptive Supply), which is based on the pre-output power of the power amplifier, combined with the power amplifier's own parameters to automatically adjust the working voltage of the power amplifier, according to theoretical calculations, It can help the system save 40% of its energy compared to the battery direct power mode. Compared with ET mode, APT is simpler and more convenient to use and design. SuPA's current products mainly support this mode. Dual certified Solar Cable are the kind of cable specially used for solar power generation system. It has dual professional certification functions, with the advantages of high quality and high efficiency.
4. Safe and reliable: the solar cable has undergone strict safety testing and certification, and has good safety performance, which can prevent current leakage and fire and other safety problems.
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Powering RF power amplifiers in handheld devices has always been a difficult design because on the one hand, it is necessary to improve the working efficiency of RF power amplifiers to extend the working time of the battery, and on the other hand, it can not reduce the work of the power amplifier while improving work efficiency. Performance, so it must be provided with a high efficiency DC power supply that meets the requirements. The conventional way is to connect the power supply terminal of the power amplifier directly to the battery, but this mode of operation will make the power amplifier's working efficiency very low and cannot meet the high efficiency and low power consumption requirements. Texas Instruments' SuPA (Supply for Power Amplifier) ​​series of DC/DC products have been innovative in terms of working mechanism, using average power tracking (Average Power Track) technology and envelope tracking technology (Envelop Tracking) to optimize RF power amplifier operation. Time power consumption, which improves the working efficiency of the power amplifier and prolongs the working time of the battery. This article focuses on the working principle of the average power tracking technology and the application design of SuPA, so that design engineers can quickly understand and apply this technology to achieve efficient power amplifier power supply design.
The development trend and characteristics of RF power amplifiers have been transferred from 2G to 3G and 4G with the increasing number of data services. Therefore, power amplifiers are required to undertake more tasks. Therefore, power amplifiers are required to have more working modes and frequency bandwidths to meet the requirements of different regions. At the same time, it is necessary to meet higher working efficiency to maintain the battery's long-term battery life. Therefore, in order to meet this requirement, RF power using ET mode or APT mode is gradually becoming a trend.
Envelop Tracking and Average Power Track 
Figure 1: Average power tracking (APT) mode, energy consumption area, red part is the consumption area (please read the PDF document for details)
The main features of dual certified solar cables include:
1. Efficient transmission capacity: Solar cables use materials with high conductivity, which can effectively transmit the electrical energy generated by solar power generation systems.
2. High temperature resistance: Solar cable can withstand high temperature environment, will not be damaged because of long-term exposure to the sun.
3. Uv and weather resistance: Solar cable has good UV resistance and weather resistance, and can be used in outdoor environments for a long time.
In short, double-certified solar cable are the efficient, safe and reliable cable products, which can meet the needs of solar power generation system for power transmission and provide reliable support for the operation of solar power generation system.