基于ads宽频低噪声放大器的的设计毕业设计（论文）.doc

大学本科生毕业设计论文 基于ADS宽频低噪声放大器的设计 摘要 选用噪声较小、增益较高且工作电流较低的放大管ATF55143，利用两种负反馈和宽带匹配技术，结合ADS软件的辅助设计，研制出宽带低噪声放大器。该放大器成本较低，体积较小，可应用于各种微波通讯领域。介绍了射频宽带放大器的设计原理及流程。设计实现的射频宽带低噪声放大器，采用分立器件和微带线匹配，选用Agilent公司生产的低噪声增强赝配高电子迁移率晶体管ATF55143，用ADS软件进行设计、仿真和优化。由于设计频带覆盖了多个通信常用频点。因此决定此低噪声放大器的应用会十分广泛。最后利用Protel99软件对电路进行了版图设计，并在FR4基板上实现了该设计，给出了设计结果。为了降低接收前端的噪声，设计并制作一种超宽带低噪声放大器。基于负反馈技术和宽带匹配技术，利用Avago ATF-54143 PHEMT 晶体管设计了放大器电路。运用ADS2009 对重要指标进行仿真及优化。实测结果表明，在0.1~2.0 GHz 范围内，其增益大于36 dB，平坦度小于±3 dB，噪声系数小于1.2 dB，工作电流小于60 mA，驻波比小于1.8。该放大器性能良好，满足工程应用要求，可用于通信系统的接收机前端。 关键宇：低噪声放大器；噪声系数；匹配；电子技术；超宽带；微波通讯；超宽带；负反馈。  Design of wideband low noise amplifier based on ADS software simulation Abstract A new ultra-broad band low noise amplifier (LNA) was developed to use ATF55143 amplifier tube which has low noise、high gain and low operating current, based on two negative feedbacks and wideband impedance matching technologies and ADS software subsidiary design. This LNA can be widely used in microwave communication areas.Design philosophy of the RF wide-band low noise amplifier is presented．The fabricated low noise amplifier is cascaded with both of detached devices and micro-strip matching network．This design uses the chip of Agilent PHEMT ATF-551M4andis simulated with Agilent ADS software． This LNA is fabricated on the FR4 with PCB drawn by Protel99se．The final test data is also provided．To reduce the noise of receiving front-ends，the design and fabrication of an ultra-wide band Low Noise Amplifier(LNA)，were presented based on negative feedback and wide band matching technologies. The amplifier tube ATF-54143 made by Avago was chosen for this design，whose key indexes were simulated and optimized by using ADS2009. The test results indicate that the LNA shows the gain above 36 dB, flatness below ±3 dB, operating current below 60 mA and noise figure less than 1.2 dB, with low cost and small volume. The good performance of this amplifier satisfies the requirement of engineering application，and it can be applied t