In1 pMOS Network In2 Pull Up Network (PUN) … InN f(In1,In2,…InN) In1 nMOS Network In2 … Pull Down Network (PDN) InN PUN and PDN are dual logic networksĪ B X Y A B X Y NMOS TransistorsSeries/Parallel Connection The pMOS network is on and the nMOS network is off.The nMOS network (PDN) is on and the pMOS network (PUN) is off.The complementary operation of a CMOS gate.This is contrasted to the dynamic circuit class, which relies on temporary storages of signal values on the capacitance of high impedance circuit nodes.The outputs of the gates assume at all times the value of the Boolean function, implemented by the circuit (ignoring, once again, the transient effects during switching periods).At every point in time (except during the switching transients) each gate output is connected to either VDD or VSS via a low-resistive path.Current inputs Output = f(In) Output = f(In, Previous In).Sequential Logic Out Combinational Logic circuit In Combinational Logic circuit In Out State Combinational Sequential CMOS Digital Integrated Circuits Lec 10 Combinational CMOS Logic CircuitsĬombinational vs.
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