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COMBINATIONAL LOGIC

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COMBINATIONAL LOGIC

At every point in time (except during the switching

transients) each gate output is connected to either

V

or

V

via a low-resistive path.

DD

ss

The outputs of the gates assumeat all timesthevalue

of the Boolean function, implemented by the circuit

(ignoring, once again, the transient effects during

switching periods).

This is in contrast to the

dynamic

circuit class, which

relies on temporary storage of signal values on the

capacitance of high impedance circuit nodes.

- Transistors can be thought as a switch controlled by its gate signal
- NMOS switch closes when switch control input is high

Vdd

Out

GND

In1

In2

In3

In4

VDD

GND

S

S

S

VDD

GND

In1

In2

S

VDD

Out

In1

In2

In3

In4

f

GND