If a certain frequency ω1=ω, then T(jω1) is equal to 1. In order to generate self-oscillation, there must be positive feedback, that is, the signal fed back to the input terminal and the signal at the input terminal of the amplifier have the same phase.įor the above figure, suppose the voltage amplification factor of the amplifier is K(s), the voltage feedback coefficient of the feedback network is F(s), and the closed-loop voltage amplification factor is Ku(s), then The feedback network is generally a linear network composed of passive components.įigure1. The amplifier is usually a tuned amplifier with an oscillation circuit as a load. When the feedback voltage is exactly equal to the input voltage, the oscillation amplitude will no longer increase and enter a balanced state.Īs can be seen from the figure below, the feedback oscillator is a closed loop composed of an amplifier and a feedback network. As the signal amplitude increases, the amplifier will enter a non-linear state, and the gain will decrease. The feedback oscillator is when the power is turned on, the various electrical disturbance signals in the loop are selected by the frequency selection network, and the signal of a certain frequency is fed back to the input terminal, and then the cycle of amplification → feedback → amplification → feedback, The amplitude of the signal increases continuously, and the oscillation is established from small to large. I The Principle of Feedback Oscillator 1.1 How Does the Feedback Oscillator Work? Basics of oscillators and their different typesġ.1 How Does the Feedback Oscillator Work?ġ.3 Starting Conditions of the Oscillatorġ.5 General Composition of Sine Wave OscillatorĢ.1 The Composition Principle of the Oscillatorģ.1 Brief Introduction of RC Oscillator and its Circuitĥ.1 What is a Non-sine Wave Generating Circuit?ĥ.3 Triangle Wave and Sawtooth Wave Signal Generator
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