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Signification of capacitor in ring oscillator

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niteshtripathi

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Hi all,

What is the significance of the capacitor(highlighted in red circle)attached at the top of the inverter chain.

decap.jpg
 

The capacitor is in the power supply of the Cmos oscillator so if the on-resistance of the (upper) Mosfet that turns on the supply voltage is fairly high then this capacitor prevents the oscillation signal from having AM and FM modulation.
 
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    d123

    d123

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Hi,

apart from it, any other advantage. What I know is that capacitor prevents the fluctuation in the ring top voltage which reduce the jitter in the output.


Audioguru said:
The capacitor is in the power supply of the Cmos oscillator so if the on-resistance of the (upper) Mosfet that turns on the supply voltage is fairly high then this capacitor prevents the oscillation signal from having AM and FM modulation.
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When the output of an oscillator has AM modulation then its amplitude has "jitter".
When the output of an oscillator has FM modulation then its frequency has "jitter".
 

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