
28 8
Analog Electronics
for formal
Statistica l
tolerancing, in view of the
amount of computation involved in the latter.
With the advent of computers, programs for circuit
analysis were developed, and 5ome of these ran
fast enough to permit a circuit to be analysed many
times over with random selection of each com-
ponent value within its selection tolerance band.
Given a hundred runs, the number of circuits
falling out of the performance specification gave a
very clear idea as to whether the design was
producible, or whether tighter tolerance com-
ponents were required in critical positions.
Nowadays, circuit analysis programs are avail-
abl ...