Fundamental Physics/Electronics/Electronics Oscillator

Electronics Oscillator

Electronics Oscillator is an electronics device that generates oscillation .

Passive oscillator
Active oscillator
Variation

Passive oscillator

Passive oscillator can be constructed from

LC resonance tank circuit

i(t)=Asin\omega t

\omega ={\sqrt {\frac {1}{LC}}}=2\pi f

f={\frac {1}{2\pi }}{\sqrt {\frac {1}{LC}}}

RC phase shift

i(t)=Asin\omega t

\omega ={\frac {1}{RC}}{\frac {1}{Tan\theta }}=2\pi f

f={\frac {1}{2\pi }}{\frac {1}{RC}}{\frac {1}{Tan\theta }}

Active oscillator

Active oscillator can be constructed from class A Inverting amplifier with LC tune tank in the feedback . Class A Inverting amplifier has inverting amplification factor equals to -1

Class A Inverting amplifier + LC tune tank in the feedback

i(t)=Asin\omega t

\omega ={\sqrt {\frac {1}{LC}}}=2\pi f

f={\frac {1}{2\pi }}{\sqrt {\frac {1}{LC}}}

Class A Inverting amplifier + 3 stages of RC phase shift each has a phase shift of 60^o in the feedback

i(t)=Asin\omega t

\omega ={\frac {1}{RC}}{\frac {1}{Tan\theta }}=2\pi f

f={\frac {1}{2\pi }}{\frac {1}{RC}}{\frac {1}{Tan\theta }}

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