Design Of Digital Walkie-talkie Base Band Module Circuit And It's EMC

With the development of Radio telecommunication, people's improving requirement of the telecommunication quality and the growing shortage of spectrum resources,the traditional analog walkie-talkie can no longer meets the needs. And the walkie-talkie digitization already becomes one inexorable tendency and it may replace the analog walkie-talkie for the unsurpassable advantages in the future. The hardware design system of walkie-talkie is only of great practicality but also with important theory meanings.The second chapter of this article introduced a hardware design of baseband module which is based on a combination of general DSP and dual-core MCU in walkie-talkie design for mid and low-range market.This design is rely on some special ICs, the normal DSP, MCU and other general device can also be used. It is easily integrated, flexible, and cheap in cost. And it is also have low risk and short time in design period. As it is widely used in other filed and proved of high stability in a lot of hardware system. So it is very suitable for mid and low-rang market with the high performance- price ratio。This structure is based on DSP and general MCU, therefore the selection and the DSP of the module design is the most import part in the baseband circuit.People are aware of the problems caused by EMI and EMC which can disturb electronics working, and sometimes cause equipment broken. And this problem is also happened in the digital electronic circuit design of digital walkie-talkie which is becoming a big challenge for the designers.Therefore, in the chapter 3 and 4, we will discuss some EMC design methods used in digital electronic circuit of digital walkie-talkie base band. Meanwhile EMC problem is widely exist in other high speed electronic equipment and walkie-talkie. As the research aspect of EMC design is widely existed, this article is focused on design of decoupling capacitance and ground interference suppression in walkie-talkie.