let us now understand the waveform analysis
of or- gate.
here you can see this is the or- gate and
this is the truth table of or- gate we have
recently studied in the previous section.
here you can see when either of, terminals
ay and b are at high voltage the output will
be high and if both are low output will be
low.
say at terminals ay and b these 2 signals
are applied which are varying with time and
both are digital signals.
that is at any instant either the state or
when signal is zero or it is 1.
lets see what signal we are getting at the
output of this or- gate. at which, inputs
these 2 signals are applied.
here you can see at any instant between these,
durations.
from this time, say we can also first write
down the timings like this t equal to zero
this 1 2 3 4 5 6 7. these are the seven different
instants. or you can write it is t-1 t-2 t-3
t-4 t-5 t-6 and t-7 at which the, signals
at terminal ay and at terminal b are toggling
either from state zero to 1. or from 1 to
zero again, so here you can see from zero
to, time instant t-1.
input terminal ay is at state zero but b is
at state 1.
so if either of the 2 is 1 that state of y
will be at 1 only.
so in this situation it’ll remain at 1.
now again if we further see from 1 to 2 both
are at 1 state so it’ll be carried over
to 2. and from this instant 2 to 3 here you
can see.
signal at ay is in zero state and at b is
also in zero state so this will drop to the
zero state.
if this state is zero. and again, from, time
instant t-3, here you can say, signal at ay
is in 1 state and signal at b is also in 1
state so again it will further rise.
to.
1 because both here are 1.
now from 3 to 4 we can see.
signal ay is in state 1 but b is in state
zero but either of the 2 is 1 the output will
be 1.
now further we can see from the instant 5
to 6 here we can see this is 4 5 6.
signal ay toggles to state zero but b becomes
one, so either of the 2 is 1 this will remain
1. then again from duration 6 to 7 t-6 to
t-7. both are in one state so this will still
be 1, and after this instant t is 7, ay is
in zero state b also in zero state so as both
are low it’ll also be low.
so this is the output waveform which will
be getting at output terminal of this or-
gate if these 2 are the input waveforms applied.
at terminals ay and b of this or- gate.
