本文叙述一种多级中频宽带晶体管放大器的设计方法
其特点是利用网络综合技术
使放大器的通频带具有契伯舍夫或最大平直型式的特陆曲线。放大器由中和了的共发射极级链接而成
级间用初级调谐的变压器耦合
叙述分三个部分:第一部分将中和了的共发射极电路用近似等效电路表示
第二部分分析级间网络
将晶体管放大器的功率增益表示成预给的频率函数后
就能导出各级间网络的谐振频率和Q值等
从而求出线路元件的数值。这些谐振频率并不是调谐到中心频率而是分布在传输频段的某些频率上的
最后举出一个数值设计实例。
This paper describes a design method of multi-stage transistor intermediate frequency wide band amplifier. The feature of design is the use of network synthesis technique for realizing the amplifier with Tschebyscheff or maximal flatness frequency characteristics. The amplifier itself consists of a cascade of RC neutralized common-emitter stages each with primary tuned interstage transformer. The discussion is divided into three parts. First
the neutralized common-emitter stage is represented by approximate unilateral equivalent circuit. Second
the interstage network is analyzed. Expressed the transistor amplifier power gain as a prescribed frequency function
it is possible to derive the limiting constraints for resonant frequencies and Q values of interstage networks
and subsequently to obtain values of circuit elements. These resonant frequencies of interstage networks are not tuned to the center frequency
but distributed at certain frequencies of the transmission band. Finally one design example is presented.
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