5、的,这就需要用放大器将其放大。高频信号放大器理论非常简单,但实际制作却非常困难。其中最容易出现的问题是自激振荡,同时频率选择和各级间阻抗匹配也很难实现。本文以理论分析为依据,以实际制作为基础,用LC振荡电路为辅助,来消除高频放大器自激振荡和实现准确的频率选择;另加其它电路,实现放大器与前后级的阻抗匹配。AbstractHigh frequency amplifier (center frequency in hundreds of KHZ to hundreds of MHZ,spectrum width in a few M
6、HZ KHZ to dozens of range), is called high frequency signal amplifier. This kind of amplifiers, according to use device, can be divided into transistor, mosfet and integrated circuit amplifier. According to the width of the spectrum, they can be divided by narrowban
7、d and broadband amplifier. According to the circuit forms, they can be divided into single level and cascade amplifier. According to the nature of load, they can be divided into used the harmonic oscillator amplifier and amplifier. So-called resonant amplifier is ad
8、opted for the load resonant circuit amplifier. According to the characteristics, the harmonic oscillator circuit has large gain for the s