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An RC phase shift oscillator uses capacitors of () pf. Find the value of resistance ‘R’ to produce frequency of 1000 kHz.

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  1. 50 kΩ
  2. 500 kΩ
  3. 25 kΩ
  4. 250 kΩ

Answer (Detailed Solution Below)

Option 2 : 500 kΩ
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Detailed Solution

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RC phase shift oscillator:

  • It consists of three pairs of RC combinations, each providing a 60° phase shift, thus a total of 180° phase shift.
  • RC oscillators are used to generate low or audio-frequency signals. Hence they are also known as audio-frequency oscillators.

The frequency of oscillation is given by:

 

Calculation:

Given, f = 1000 kHz

R = 500 kΩ 

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