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自激振荡器一般应具备反馈放大器、相移器及限幅器三个作用部件(图1).一般自激振荡器中相移器由LC振荡回路来担任,而反馈放大器和限幅器则由电子管来担任.因此自激振荡器中电子管必须运用在有栅流限幅工作状态,电子管的参数就不是一个常数,而是板流的函数,它虽能起限幅作用,但对稳频和波形失真都是不利的.本文介绍一种甲类无栅流LC自激振荡器,在电路中电子管只起反馈放大器作用,它运用在线性工作状态下.另在反馈回路中加限幅器,这样即可获得高幅度恒定度及高频率稳定度的振荡器.
Self-excited oscillator should generally have a feedback amplifier, phase shifter and limiter three role parts (Figure 1) .Generally self-excited oscillator in the phase shifter by the LC oscillation loop, and the feedback amplifier and limiter By the tube to serve.So the self-excited oscillator tube must be used in a gate current limiting operation, the parameters of the tube is not a constant, but a function of plate flow, although it can play a limiting role, but for the frequency stabilization And waveform distortion are unfavorable.This paper introduces a Class-A gate-free flow LC self-excited oscillator, the tube in the circuit only plays the role of feedback amplifier, it is used in the linear state of work.Other in the feedback loop with limiter , So you can get a high degree of constant amplitude and high frequency stability of the oscillator.