Logic Families – IQ – 4

20. What is depletion mode operation MOS ? 
If  the  channel  is  initially  doped  lightly  with  p-type  impurity  a  conducting  channel exists at zero gate voltage and the device is said to operate in depletion mode. 

21. What is enhancement mode operation of MOS ? 
If the region beneath the gate is left initially uncharged the gate field must induce a channel before current can flow. Thus the gate voltage enhances the channel current and such a device is said to operate in the enhancement mode. 

22. Mention the characteristics of MOS transistor ? 
(1) The n- channel MOS conducts when its gate- to- source voltage is positive. 
(2) The p- channel MOS conducts when its gate- to- source voltage is negative 
(3) Either type of device is turned of if its gate-to- source voltage is zero. 

23. What is 14000 series ?
It  is  the  oldest  and  standard  CMOS  family.  The  devices  are  not  pin  compatible  or electrically compatible with any TTL Series. 

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