Fundamental Physics/Electronics/Electronics Oscillator

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 60^o in the feedback

$i(t)=Asin\omega t$

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

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