recursive discrete time oscillator with dynamic amplitude control
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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.
• Dynamic amplitude control - The control technique used is Automatic Gain Control. It is used to encounter accidental instability.
Recursive Oscillator
BLOCK DIAGRAM
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 .
a=0.5 ,b=-3,c=0.25,d=0.5
a=0.5 , b=3, c=0.5 , d=0.6??
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
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
THANK YOU
SPECIAL THANKS TO DR. P. SUMATHI