Circuit symbols used for NMOS transistors

 

                      or                

 

 

Circuit symbols used for PMOS transistors

                        or                

 

 

Simplified circuit symbol used for both NMOS and PMOS transistors

(used if the type is not important)

 

 

 

Depletion mode FET

                  MOS transistor which conducts drain current when V_G = 0

                  Conducting n-type channel is built in the structure

                  Circuit symbols used for depletion-mode transistor:

 

 

 

This type of transistor was used in older MOS technologies

                                                  Not typically available in CMOS processes