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Explain Ratio Detector
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  • Ratio detector is another frequency demodulator circuit.

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Operation and phase diagram:

  • The ratio detector output voltage is equal to half of the difference between the output voltages from the individual diodes.

  • Hence similar to the phase discriminator the output voltage is proportional to the difference between the individual output voltages.

  • Due to this reason, the operation of the ratio detector is identical to the phase discriminator.

  • The S type curve can be derived in an identical way. The phasor diagrams are also identical.

  • The additional feature of the ratio detector is the amplitude limiting action which is incorporated due to the large capacitor $C_5$.

  • Due to this the amplitude limiter is not required prior to the ratio detector.

  • Advantages of ratio detector:

  1. Easy to align.

  2. Very good linearity.

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