IEEE Circuits and Systems Magazine - Q4 2022 - 77

Figure 1. The space crisis is here; we cannot exploit potential-of-space forever.
Figure 2. It is time to turn our attention from space to time; it is an overhaul of microelectronics, requiring multidisciplinary
effort.
role of voltage and time) " . As a veteran, I have seen people
in using fixed-frequency clock to drive electronics
from the outset of microelectronics. This naturally leads
to the uniform-flow-of-time inside the electronic world.
But, as Mr. Xiu asked in the book, is this efficient? Can
the electronic world employs nonuniform-flow-of-time,
as the biological world does? He argues in the book that
uniform-flow-of-time is just a dogma for the convenience
of our engineering. It does not have to be this way if there
is a need to change it and a means to implement the
change. I must say that I am convinced after poring over
his reasoning. The second idea of explicitly using time
as message is even more eccentric. Since the birth of the
art of electronics, voltage has always been used as the
FOURTH QUARTER 2022
medium for representing information, either in analog
or digital style. As transistor becomes smaller, it switches
faster. It however tends to be noisier. Further, the supply
voltage is made ever lower as process technology
progresses (meanwhile, the noise floor stays roughly at
the same level). All those factors are antagonistic to the
continuous use of voltage as message carrier since the
headroom for playing this game is unceasingly reduced.
On the other hand, the ever-faster-switching transistor
offers us an opportunity of using rate-of-switching as an
alternative for expressing our thought or informationexchange.
This idea, although not being practical yet
at current stage as admitted by the author, also sounds
legitimate to me.
IEEE CIRCUITS AND SYSTEMS MAGAZINE
77

IEEE Circuits and Systems Magazine - Q4 2022

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