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Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
book

Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition

by John G. Webster, Halit Eren
February 2014
Intermediate to advanced content levelIntermediate to advanced
1921 pages
82h 13m
English
CRC Press
Content preview from Measurement, Instrumentation, and Sensors Handbook, Second Edition, 2nd Edition
18-21Meter Voltage Measurement
e modulator operating principle is shown, in the time domain, in Figure 18.21. Let us suppose that
th
e
in
put
vo
ltage
V
in
is positive and constant and the integrator output is negative at the rst clock pulse.
Con
sequently,
th
e
co
mparator
ou
tput
V
bs
is switched to the low level by the clock pulse. e DAC output
vo
ltage
is sw
itched
to th
e
ne
gative
V
DA
value and subtracted to V
in
, so that the input signal ε to the integrator
is po
sitive
an
d
hig
h
en
ough
to fo
rce
th
e
in
tegrator
ou
tput
V
c
to become positive before the next clock pulse.
Co
nsequently,
th
e
co
mparator
ou
tput
is sw
itched
to th
e
hi
gh
va
lue
at th
e
ne
xt
cl
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Publisher Resources

ISBN: 9781439848913