4.3.6.



      
      :

 -------------------------------------------------------
                        +
			^
                        |
	                |
      N-MOS   |   N-MOS 
      N-JFET            |   NPN-BJT
			|
-   ----------------+------------------->  +
                        |
      P-MOS  |   P-JFET	
      PNP-BJT           |
			|	
		      -
 -------------------------------------------------------

n-MOSFET enhanced:


p-MOSFET enhanced:








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