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propagation delay with voltage swing

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rameshbalan

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i have one doubt. when the input peak to peak voltage level of the inverter decrease, the propagation delay decrease. what is the limit that i have the voltage level to get low propagation delay?
 

voltage swing means signal transition from low to high.propagation delay depends on transition time.

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voltage swing means signal transition from low to high.propagation delay depends on transition time.
 

Wouldn't the propagation delay increase (circuit gets slower) as the input voltage is decreased? You can lower your voltage level up to 800mV just to be sure that you still operate above the threshold voltage of the transistors.
 

no, actually when the peak to peak voltage swing increases, the slew rate of the voltage swing decreases.so the speed of the waveform increases. even the device operate above the threshold level, the speed of the device for various slew rate is not same.
 

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