文档介绍：分立LC阻抗匹配网络的ads仿真
分立LC阻抗匹配
摘要:阻抗匹配的概念是射频电路设计中最为基本的概念,贯穿射频电路设计始终。阻抗匹配就意味着源传递给负载最大的RF功率,换句话说就是要实现最大的功率传输,必须使负载阻抗与源阻抗匹配。然而,他们的功能并不仅仅为了减小功率损耗而设计的,他们还具有其他功能,如减小噪声干扰、提高功率容量和提高频率响应的线性度等。通常认为,匹配网络的用途就是实现阻抗变换,就是将给定的阻抗值变换成其他更合适的阻抗值。
关键字:射频;阻抗匹配;阻抗圆图;ADS
Abstract: The concept of impedance matching in RF circuit design the most basic concepts, through the RF circuit design has always been. Impedance matching means that the source is passed to the load maximum RF power, in other words, to achieve maximum power transfer, the need to load impedance and source impedance matching. However, their function is not only designed to reduce power consumption, they also have other functions, such as reduced noise, increased power capacity and improve frequency response linearity. Is generally believed that the use of works is to achieve impedance transformation is given impedance value into other more appropriate impedance value.
Keywords: RF; impedance matching; impedance circle diagram; ADS
一、设计要求:
使Zs=25-j*15 Ohm信号源与ZL=100-j*25 Ohm 用分立LC设计一个L型阻抗匹配网络,
的负载匹配,频率为50Mhz。
二、设计原理:
阻抗匹配原理
阻抗匹配是无线电技术中常见的一种工作状态,它反映了输人电路与输出电路之间的功率传输关系。当电路实现阻抗匹配时,将获得最大的功率传输。反之,当电路阻抗失配时,不但得不到最大的功率传输,还可能对电路产生损害。阻抗匹配常见于各级放大电路之间、放大器与负载之间、测量仪器与被测电路之间、天线与接收机或发信机与天线之间,等等。例如,扩音机的输出电路与扬声器之间必须做到阻抗匹配,不匹配时,扩音机的输出功率将不能全部送至扬声器。如果扬声器的阻抗远小于扩音机的输出阻抗,扩音机就处于过载状态,其末级功率放大管很容易损坏。反之,如果扬声器的阻抗高于扩音机的输出阻抗过多,会引起输出电压升高,同样不利于扩,音机的工作,声音