So why does a sine wave oscillator

So why does a sine wave oscillator produce a sine wave of its own? How can it produce sinusoidal oscillation to meet our proposed frequency and amplitude requirements? Finally, how can this sinusoidal oscillation maintain its fixed oscillation frequency and amplitude under external disturbance? These are the basic questions that we will discuss below. Amplifier circuit is a typical two-port network, oscillator circuit is a typical single-port network, only one RF signal output port. From the point of view of energy conversion, the RF amplifier and the RF oscillator circuit are both the energy of the direct current converted to the specific frequency of the RF signal. The difference between them is that the oscillator circuit has no input of RF signal, while the amplifier circuit must have input of RF signal. The technical indexes of the Oscillator circuit include: The accuracy and stability of the frequency of the output RF SIGNAL; 2 the accuracy and stability of the amplitude of the output RF SIGNAL; 3 the waveform distortion of the output RF signal; IMPEDANCE and maximum output power of RF signal output port. The design of the RF oscillator circuit should be carried out according to the above technical specifications. Usually, the above technical specifications can be found in the parameters of RF signal source.