Mayank
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Hi Dipankar, As far as i remember, Antenna Diodes work on forward bias voltage...What i mean to say is that antenna diodes prevent Gate voltage to exceed supply voltage by more than Von(0.4~0.7V) of the Antenna Diode...Not the Reverse BreakDown Voltage of the diode....
Consider this :-- You tie the Gate of a MOS at +ve-jnxn and Vdd at -ve-jnxn of the diode....In normal operation, it is reverse biased...In case, charge got accumulated at the gate and Gate Votlage exceeded the supply voltage by more than Von of the Diode, Immediately diode will become ON and would facilitate charge flow from gate bringing it back to <=supply voltage. Sounds LOGICAL, right ?? Maybe some ESD expert can explain better...
--regards, mayank
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