All components have delay time What is the effect of delay t

All components have delay time. What is the effect of delay time? For example , if delay time of a circuit is 20 ns, and there are 10 of these circuit cascaded?

Solution

For example if the flip flops circuit is considered then the delay time is represented in terms of propagation delay.

When gate inputs change,output don\'t change instantaneously this is called propagation delay.Maximum propagation delay is the longest delay between an input changing value and the output changing value .the path that causes this delay is called critical path.

For example if each flipflop is negative edge triggered and has propagation delay of 20ns.the output changes due to the 10 flipflop connected in cascade

Tp= 10*20ns = 200ns

Maximum clock frequency fmax = 1/Tp = 1/200ns

= 5Mhz