16W CDMA APD RF Power Amplifier Design

With the continuous development of communication networks, the third generation network capture the market quickly. Third-generation network system need to provide a wide variety of types of business and individuals, to provide anytime, anywhere services to wireless users, a good communication network coverage is essential.in addition to the base station, repeater system of various types play a very important role, solve the weak signal area, blind spot problem effectively. Base station and repeater systems as a key power amplifier RF devices, RF signal through a nonlinear amplifier will generate spread spectrum and other intermodulation distortion, its performance directly affects the normal communication and communication quality. Multi-carrier modulation and QPSK and other technology is the rapid development of these technologies,which need a higher linearity requirements.Based on the design of CDMA power amplifier repeater system needs, the design of this amplifier output power is 16W. A power amplifier distortion theory and the power amplifier distortion model has a strong significance for physical design of the amplifier. Then to design amplifier Based on technical indicators.Make some introduction about feedback,forwardback predistortion linearization techniques.I selected analog predistortion power amplifier technology on the basis. Because the analog predistortion circuit is relatively simple, relatively lowcost.power amplifier design needr to confirm the first radio link:the link of the power amplifier, amplifier type., the power supply unit, as well as control module.Amplifier tube selection and final amplifier tube simulation is the focus, ADS simulation software can do nodal analysis, bias circuit design, and then make a matched load pull and source pull simulation and overall optimization. Amplifier tube before the end do the same way.Amplifier circuit board layout and structural design process is to face the problem of power amplifier. PCB layout in order to reduce electromagnetic interference.I should give full consideration about thermal performance, choose the appropriate structure and appropriate technology.Of course, the power amplifier debugging is important part. To need to Step by step debug amplier tube and make a overall amplier debugging.I will select the best version to meet all targets.