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Recursive Discrete Time Oscillator with Dynamic Amplitude Control

Recursive Discrete Time Oscillator with Dynamic Amplitude Control. G.K. Vikram (10115044) Arka Ghosh (10115024) Debasmit Das (10115039). TWO ENTITIES. Recursive Oscillator – It is a numerical oscillator which can be described by a recurrence relation.

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Recursive Discrete Time Oscillator with Dynamic Amplitude Control

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  1. Recursive Discrete Time Oscillator with Dynamic Amplitude Control G.K. Vikram (10115044) ArkaGhosh (10115024) Debasmit Das (10115039)

  2. TWO ENTITIES • Recursive Oscillator – It is a numerical oscillator which can be described by a recurrence relation. • Dynamic amplitude control - The control technique used is Automatic Gain Control. It is used to encounter accidental instability.

  3. Recursive Oscillator BLOCK DIAGRAM

  4. STATE EQUATION |zI – A | = 0 and |z|=1 Yields the condition of a sustained oscillations - ad – bc =1 and | a+d | < 2 So these parameters determine whether the oscillator is stable .

  5. a=0.5 ,b=-3,c=0.25,d=0.5

  6. a=0.5 , b=3, c=0.5 , d=0.6??

  7. Calls for Automatic Gain Control • Gain is tuned according to the amplitude of the signal • If signal is weak then gain should be large and if signal is strong gain should be weak. • Applications : Radio Sets , Amplifiers • No Approximation of Gain required

  8. REFERENCES • Clay S. Turner , A Discrete Time Oscillator for a DSP based Radio • Clay S. Turner, DSP Tips & Tricks, IEEE Signal Processing Magazine • www.google.co.in

  9. THANK YOU SPECIAL THANKS TO DR. P. SUMATHI

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