HP 8082A Operating And Service Manual page 28
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- Operating and service manual (113 pages) ,
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- Operating and service manual (17 pages)
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EXTERNAL
SOURCES (DELAY OR WIDTH
VERNIER)
Figure 4-5. Delay Generator
4 - 2 4
The input is common to both the slow and
fast parts of the Delay Generator. If the delay range
switch is set to 2-5ns, the fast section is used. In this
case the 2ns wide pulse spike from the Transition Detec-
tor turns transistor Ql on and rapidly charges internal
capacitor C! . The Schmitt trigger turns on when its thre-
sistor 01 turns off and capacitor Cl discharges into the
current sink. The rate of discharge is determined by the
current setting (de!ay vernier). The Schmitt trigger turns
off again when the voltage of C? falls below the threshold
level. Thus the output of the Schmitt trigger is a step
wave of width dependent on the delay vernier setting.
4 - 2 5
case, the 2ns wide pulse turns on the Schmitt trigger in
the slow circuit and one of the outputs of this Schmitt
trigger turns transistor Q2 off. Thus the current source
connected to Q2 now starts to charge the externa! capa-
citor C2 (the value of this capacitor depends on the
CURRENT
INPUT
range switch setting!. The Schmitt trigger turns off again
when the voltage on C2 has reached the threshold level.
Therefore transistor Q2 turns on again and as current
is greater than I!, capacitor C2 starts to discharge again.
Thus the output of the Schmitt trigger is a square wave
of width dependent on the delay range switch setting and
the delay vernier setting.
4 - 2 6
The outputs of the two Schmitt triggers are
puts of the OR gate is passed through a 2ns delay line. The
overall effect of the logic gating is to produce, at the De-
lay Generator output, a 2ns pufse that is delayed on the
Delay Generator input by the delay control settings.
4-27
The output of the Delay Generator is input
to tie Width Generator integrated circuit
used in both the Delay and Width Generator circuits are
identical and the description of the Delay Generator ope
ration in paragraphs 4-23 to 4-25 also applies to the
Width Generator. The difference is in the output gating;
the output of the Width Generator is a pulse of width
The E's
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