摘要：为减小功率放大器的尺寸和提高放大器的效率,可以利用晶体管的漏端寄生结电容作为E类射频功率放大器的分流电容。文章提出根据晶体管漏体寄生结电容来设计E类CMOS功率放大器,在BSIM3V3漏体结电容模型的基础上,分析了漏端边缘电容对设计的影响,同时,采用数据拟合来降低计算复杂度。仿真结果表明,该方法可运用于实际设计。文章的研究为低功耗E类CMOS功率放大器的小型化设计提供了一种新的方法,具有一定的应用参考价值。

摘要：Regulating the selectivity of catalysts in selective hydrogenation reactions at the atomic level is highly desirable but remains a grand challenge. Here we report a simple and practical strategy to synthesize a monolithic single-atom catalyst(SAC) with isolated Pd atoms supported on bulk nitrogen-doped carbon foams(Pd-SAs/CNF). Moreover, we demonstrate that the single-atom Pd sites with unique electronic structure endow Pd-SAs/CNF with an isolated site effect, leading to excellent activity and selectivity in 4-nitrophenylacetylene semi-hydrogenation reaction. In addition, benefiting from the great integrity and excellent mechanical strength, monolithic Pd-SAs/CNF catalyst is easy to separate from the reaction system for conducting the subsequent recycling. The cyclic test demonstrates the excellent reusability and stability of monolithic Pd-SAs/CNF *** discovery of isolated site effect provides a new approach to design highly selective catalysts. And the development of monolithic SACs provides new opportunities to advance the practical applications of single-atom catalysts.