- A number of inputs
- A number of outputs
- Output signals changes depending on
- input signals
- feedback from output signals !
- Analog circuits:
input and output signals takes on values from a continous range
Example: Amplifier
- Notice that the input and output signals varies over a continuous range.
- Digital circuits:
input and output signals takes on discrete values
Example: "Not" circuit
- Here is a live demo of a not-circuit: click here
- Notice that the input and output signals only takes on two values (high and low)