Electronic oscillator
Startup and amplitude of oscillation

During startup, while the amplitude of the oscillation is small, the circuit is approximately linear, so the analysis used in the Barkhausen criterion is applicable. When the amplitude becomes large enough that the amplifier becomes nonlinear, technically the frequency domain analysis used in normal amplifier circuits is no longer applicable, so the "gain" of the circuit is undefined. However the filter attenuates the harmonic components produced by the nonlinearity of the amplifier, so the fundamental frequency component sin ω 0 t {\displaystyle \sin \omega _{0}t} mainly determines the loop gain (this is the " harmonic balance " analysis technique for nonlinear circuits).
language:response_language[Spanish], detectable_format:multiple_sections[2], length_constraints:number_words[202]