Cost- optimized design and implementation of RF power amplifier
|School||Huazhong University of Science and Technology|
|Course||Electromagnetic Field and Microwave Technology|
|Keywords||Optimization PA Linear Technology Feedforward|
With the rapid development of wireless communication technology , wireless communications products with more and more closely related to people's lives . As a wireless communication system, an important support technology of the RF power amplifier design techniques have been innovation . RF power amplifier design is moving broadband, high linearity , high efficiency forward direction . And because of various variable envelope digital modulation techniques widely used, the amplifier linearity requirements of particular urgency . Feedforward linearization technique is the large number of the most popular techniques and proved to be the most promising technologies. This paper presents a technique using feedforward design work on the CDMA network down , low-cost power amplifier. This paper describes the importance of high linearity power amplifier , and through comparative analysis of current popular power amplifier design techniques drawn feedforward technology advantage. The second part describes the key indicators of the power amplifier , power amplifier classification and stability of the judgment. The third part introduces the feedforward order system works , the design of the overall program and the specific circuit unit design . These include the device selected, the input part of the circuit design, power supply parts of the circuit design , the detector circuit design , automatic level control circuit design, the main signal cancellation loop amplifier simulation and design , the design of the distortion signal amplifier . The last part gives the product assembly and debugging considerations , and product measured data . The maximum output power amplifier design can reach 45dBm, third-order intermodulation less than -55dBc, adjacent channel power ratio can be achieved -47dBc and -61dBc. But the system remains to be simplified , and certain indicators can also be improved, which are needed in the future work to perfect . Its main tasks are : first, the launch of the Agilent ADS simulation software selection amplification tube simulation ; followed and the part of the overall program design system specific circuit ; Finally, the design of products for assembly , commissioning and testing.