# Fundamental Physics/Electronics/Electronics Oscillator

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## Electronics Oscillator

Electronics Oscillator is an electronics device that generates oscillation .

1. Passive oscillator
2. Active oscillator
3. 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 60o in the feedback

$i(t)=Asin\omega t$ $\omega ={\frac {1}{RC}}{\frac {1}{Tan\theta }}=2\pi f$ $f={\frac {1}{2\pi }}{\frac {1}{RC}}{\frac {1}{Tan\theta }}$ 