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EXAMPLE
OF TRACK/HOLD
MEA-SUREMENT
SEOUENCE
a'
During
the
period
6T1,
circuits
are in
the Tract+,Mode
and
in'put
switch
SA is
connected
to the
lnput
terminal.
P' .f'1r
a
S/H T-rigger
command
is received.
Circuit
A holds
within
400
nanoseconds,
and
Circuit
B
holds
about
2
milliseconds
later.
c. At
t2,
54
is switched
to
ground.
2T3
is
settling
time
for
the
amplifiers.
d'
3To
is the
run-up
time
for the
integrator.
sg is
connected
to
the
I ntegrator
inpu.
e'
From
t4to
t7,sg
is crosetJ
to
ground
and
no
current
is
suppried
to
the
Integrator.
f'
At t5,
s4
is
switched
to
the
-
Reference.
5T6
is about
4 ms
long.
Hold
A
occurs
2
ms after
t5
and
Hold
B
occurs
at t6.
9.
54
is
switched
to
ground
at t6,
and
6T7
is used
for
amplifier
settling
time.
h'
sg
is
switched
to
the
lntegrator
input
during
7Tg.
tg
is
the
zero
detect
point.
i'
At
t0,
all
circuits
are
returned
to
the
Track
Mode
and
s4
is again
connected to the
lnput
terminal.
Waveforms
are
not
drawn
to
time
o,
"o,,rn"
I?[lt
Decay
of
circuit
A
output
signal,
v3,
is eägger;d
for
the
purpose
of
this
iilustration.
3490
INTEGRATOR
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TIMING
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