Mobile phone design skills Mobile phone RF design skills 1. What is RF? Answer: RF stands for Radio frequency, which mainly includes wireless transceivers. 2. What are the frequencies of mobile phones in the world today (CDMA, GSM, local telephone, PHS, analog mobile phones, etc.)? Answer: EGSM RX: 925-960MHz, TX:880-915MHz; CDMA cellular (IS-95) RX: 869-894MHz, TX:824-849MHz. 3. How should a novice who has just been working on mobile phone RF improve himself? Answer: First, you should have a systematic understanding of the RF system (such as functionality), and then you can choose some chipsets and study the connectivity among them. 4. What is the role of RF simulation software in mobile phone design and debugging? Answer: Its purpose is to let the designer have some understanding of the product to be designed before implementing the design. 5. What is the basic principle when designing the PCB of a mobile phone? Answer: The basic principle is to minimize EMC. 6. The hardware structure of a mobile phone includes RF/ABB/DBB/MCU/PMU. What do ABB, DBB and PMU stand for? Answer: ABB stands for Analog BaseBand, DBB stands for Direct Baseband, and MCU is often included in the DBB chip. PMU stands for Power Management Unit. Some mobile phones now have PMU and ABB on the same chip. In the future, these chips (RF, ABB, DBB, MCU, PMU) will be integrated into one chip to save cost and volume. 7. What are the main functions of DSP and MCU? What is the difference between the two? Answer: In fact, MCU and DSP are both processors, and there is not much difference between them in theory. However, in actual systems, based on efficiency considerations, DSP generally handles various algorithms, such as channel encoding and decoding, encryption, etc., while MCU handles signaling and communicates with most hardware peripherals (such as LCD, etc.). 8. What should novices who are just starting to engage in RF front-end design pay attention to? Answer: First of all, you can choose a...
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