Research And Design Of The RF Power Amplifier

With the development of wireless communications and microelectronics technologies, modern communication is developing towards adding channel capability, multi-carrier, multi-level, widening the frequency and higher PAR. All these changes make the design of wireless communication equipment more difficulty. As the core of the transmitter, the performance of RF power amplifier restricts the technique level of the whole system. We discuss the design process of RF power amplifier and have designed and implemented RF power amplifier of base station with high power adding efficiency and spectrum utilization ratio application in WCDMA and CDMA2000. The works included in this paper are as follows:1. RFPA is introduced including technical indicators, technical requirements and general methods of design, and then the method to improve the memory effect by circuit design is put forward to.2. The whole RFPA circuits are designed by ADS. The performance of each parameter is traded off by special design of broadband matching circuit and joint multi-objective optimization. While, the circuit to DC power supply and temperature compensation is also designed.3. The radiating, crosstalk and resonance of PCB is analyzed, the PCB of RFPA is designed by Protel according to the EMC principle. Moreover, a shielding box is designed to cool and shield the RFPA. The FDTD method is utilized to analyze the change of electric field while adding to the shielding box.4. Bias circuit of RFPA is tested, and test schemes including S parameters, single-tone, two-tone signals and WCDMA signals have been put forward to.