RC PHASE SHIFT OSCILLATOR


       The above figure shows a RC PHASESHIFT OSCILLATOR . The phaseshift network consist of three RC voltage dividers . At the operation frequency of each RC network introduce a phase shift of 600 and the total by three RC is 1800 , anot6her 180 is produced at the input of the inverting amplifier(RC networks connected to –ve terminal of amplifier so it is inverting). So the total phase shift is 3600(condition for standard oscillation).
DESIGN           
OSCILLATOR FREQUENCY F=1/2∏RC = 1khz
Take C1=C2=C3=0.1µF
Then R1=R2=R3= 680Ω
Gain  RF/RI = 29
 Take Ri = 1.2KΩ
Then RF = 34.8 KΩ commonly we use 100k pot.

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