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Oscillators

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Types of Oscillators
  1. Tuned LC Oscillator : 617.png
    where, L1 is the inductance in Henry
    C1 is the capacitance is Farad
    f is the output frequency in Hertz 

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Fig. : Tuned LC oscillator

  1. Hartley Oscillator
    628.png
    where LT = L1 + L2 + 2M 

The Hartley Oscillator consists of a parallel LC resonator tank circuit whose feedback is achieved by way of an inductive divider.
 

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Fig. : Hartley oscillator

  1. Colpitt’s Oscillator
    The basic configuration of the Colpitts Oscillator resembles that of the Hartley Oscillator but the difference this time is that the centre tapping of the tank sub-circuit is now made at the junction of a “capacitive voltage divider” network instead of a tapped autotransformer type inductor as in the Hartley oscillator.
    The frequency of oscillations for a Colpitts Oscillator is given as:
    638.png 

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Fig. : Colpitt’s oscillator

  1. Phase shift RC Oscillator :
    648.png
    where N is the number of RC stages (N = 3) 

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Fig. (d) : Phase shift RC oscillator

  1. Crystal oscillator :
    658.png
    Series resonant frequency 663.png
    Parallel Resonant Frequency 668.png
    where
     
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Fig. : Crystal oscillator

  1. Wien Bridge Oscillator :
    684.png
    or R = R1 = R2; C = C1 = C2
    689.png = 694.png  

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Fig. : Wien bridge oscillator





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