Difference Between Foster Seeley and Ratio Detector | New Topic
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In this note, we are going to learn about the difference between foster seeley and ratio detector or foster seeley vs ratio detector. Welcome to Poly Notes Hub , a leading destination for engineering notes for diploma and degree engineering students.
Author Name: Arun Paul .
Difference Between Foster Seeley and Ratio Detector
Here we have listed some differences between the Foster Seeley discriminator or phase discriminator and the ratio detector circuit –
Before going through the difference table, if you want to learn about the Foster Seeley Discriminator and Ratio Detector then click on the links below –
Fooster Seeley Discriminator Vs Ratio Detector
Parameters Foster–Seeley Discriminator Ratio Detector 1. Basic Function Converts frequency variations of FM signal into amplitude variations (demodulation). Also converts frequency variations into amplitude variations, but provides additional amplitude limiting. 2. Circuit Difference Uses two diodes and a tuned transformer circuit. Similar circuit, but one diode (D₂) is reversed, and a large capacitor (C₅) is added. 3. Amplitude Limiting Not provided. It requires an additional amplitude limiter stage to remove noise.Provided inherently due to large capacitor C₅ — hence, no separate limiter needed.4. Output Point Output is taken across the two diode load resistors. Output is taken from a different point in the circuit (across the capacitor network). 5. Sensitivity to Amplitude Variations Sensitive to amplitude variations — noise or interference can affect output. Less sensitive to amplitude variations — built-in amplitude limiting reduces noise. 6. Linearity Linearity is good but can be affected by amplitude changes. Provides better linearity because amplitude variations are suppressed. 7. Complexity Slightly simpler circuit. Slightly more complex due to added capacitor and altered diode direction. 8. Use of Large Capacitor No large capacitor used for amplitude limiting. Includes a large capacitor (C₅) for amplitude limiting action. 9. Output Voltage Relation Output voltage is proportional to the difference of diode voltages. Output voltage is proportional to the ratio of diode voltages (hence the name “ratio detector”). 10. Noise Immunity Poor noise immunity. Better noise immunity due to amplitude limiting.
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Difference Between Foster Seeley and Ratio Detector | New Topic
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Difference Between Foster Seeley and Ratio Detector | New Topic
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Difference Between Foster Seeley and Ratio Detector | New Topic
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