Phase-shift angle of RC network in phase-shift oscillator

Q.  What is an angle of phase shift for each designed RC network in the Phase Shift Oscillator circuit?
- Published on 23 Sep 15

a. 30°
b. 60°
c. 90°
d. 180°

ANSWER: 60°

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    R-C phase shift oscillator consists of three identical basic R-C phase shifting type of networks arranged in the cascade configuration.

    Thus, the total phase shift introduced by three stage R-C network is equal to 180o, which implies that the output of network leads its input by 180o. Therefore, it infers that each phase-shift stage acquires the phase shift of about 60o.

    RC network is also renowned as 'Ladder network'. The phase-shift of about 180o is generated especially at one particular frequency, which is considered to be the frequency of operation of oscillator.

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