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+7.7v
1.8v
Le
ev
|
Design
Center
1.8v
\
N
Output
of
switching
multi
with
respect
to
the
DC
level
at
the
emitters
of
Q354
and
Q364.
+4
./Vv
Figure
4
Figure
4 shows
the amplitude
relationship
of the multi
output
to
the
emitter
voltage
of
Q354
and
Q364.
Note
that
when
the
multi
output
is
negative
going,
the
fast
portion
of
the
pulse
is
used
to
switch
the
diodes.
In the ADD mode,
both
transistors
are off and
R323
(3322)
is
Switched
in
to
provide
a constant
current
drain
to
the
+10v
supply,
which
insures
that
the
+10v
will
remain
constant.
In
the
ALT
and
CHOP
modes,
pulses
are
supplies
from
the
trigger
BO
to
switch
the
multi.
With
a 547
whose
HORIZONTAL
DISPLAY
is
set
to A ALT
B,
a
- going
step
is
sent
to
the
base
of
Q325
through
C326 (47 pf) at the end of each A sweep.
C326 differentiates the
step
to
provide
a sharp
trigger
pulse
to
turn
on
Q325.
Thus
the
Channel
2 output
will
be
displayed
on
the
following
B sweep.
At
the
end
of
the
B sweep,
the
trigger
BO
receives
a signal
that
tells
it
to
trigger
the
switching
multi.
Since
the
output
of
the
BO
always
tells
the
on
transistor
to
turn
off,
Q325
will
turn
off
and
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