HP 8082A User's manual

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MANUAL PART No, 08082-99003
OPERATING AND SERVICE MANUAL
SERIAL NUMBERS
This manual applies directly to instrument with serial number
19772602846 and higher. Any change made in instruments having serial
numbers higher‘ than the above number will be found in a “Manual
Changes" supplement supplied with this manual. Be sure to examine the
supplement for changes which apply to your instrument and record these
changes in the manual. Backdating information for instruments with
lower serial numbers can be found in Section 7 (yellow pages).
c HEWLETT-PACKARD GMBH 1983
HERRENBERGER STR. 110, D-7030 BOBLINGEN
FEDERAL REPUBLIC OF GERMANY
PRINTED: SEP 1983
MICROFICHE PART No, 08082-90503 Printed in the Federal Republic of Germany
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SECTION 1—
1—1 INTRODUCTION
12 The 8082A is a 250 MHz dual channei pulse
source with variable leading and trailing edge transition
times as fast as Ins. It also has variable puise frequency,
delay, width, offset and amplitude. The normal/compie-
ment relationship and the polarity of either output can
he reversed. Single puise, double pulse and square wave
operation are available. There are also four trigger
modes:
1—3 Normal Mode. in this mode the 8082A oper-
ates as a self-contained pulse source with full control
of the pulse parameters from the front panel controls.
1-4 Ext Trig Mode. In this mode the pulse and
trigger output frequencies are determined by the fre-
quency of an externally applied signal. The other pulse
parameters are varied from the front panel controls,
GENERAL INFORMATION—
1—5 Gate Mode. In this mode a gating signal
enables the pulse and trigger outputs.
1-6 External Width Mode. in this mode the puise
frequency and width are determined by the frequency
and width of an externally applied signal. The delay be-
tween input and output is fixed. The trigger output -
is the shaped trigger input signal.
1-7 ECL OUTPUT
1-8 The 8082A has an ECL position on each of
its amplitude range switches, When either or hoth of
the switches are set to this position, both 8082A outputs
automatically deliver a fixed voltage swing of —0.9Y to
—1.7V typical tinto an open circuit) for driving ECL |
logic. |
1—2
Table 1—1 Specifications |
These specifications apply when:
PULSE CHARACTERISTICS
(Source and load impedance 5052)
Transition Times:< ins to 0.5ms in
& ranges. First range from < ins to
5ns controls leadingand trailing edges
simultaneoulsy. For all other ranges
transition times variable independent-
lv up to 1:10.
Difference between risetime and fail-
time is less than 25% of the faster
transition time of the two.
Overshoot and Ringing: < + 5% of
puise amplitude may increase to
+ 10% with amplitude vernier CCW.
Preshool: < £ 5% of pulse amplitude.
Linearity: [Linearity aberration for
both siopes < 5% for transition times
> Hrs,
Output: Maximum amplitude is SV
from 50€ into 50€. Maximum out-
put voltage is + 5V (amplitude + off-
set}. | |
Offset: > + 2V, into 500
Baseline: OV + 1DOmV with offset
switched off. and amplitude range
set to maximum. Other ampiitude
ranges reduce baseline proportionately.
DC-Source Impedance: 5080 £ 5% .
Reflection Coefficient: Reflection 18
2% typical for steps with 1nsrise time
applied 10 output connector on all
amplitude ranges except SV range.
On the BV range, the reflection may
be 15%. |
Output protection: Cannot be da:
maged by open or short circuits or
application of ext < + 6 volts. or
+ 200mA independent of control set-
tings.
Attenuator: Two separate three step-
attenuators reduce the outputs to ТУ,
Vernier is common for both outputs
and reduces the output to 0.4V
minimum. A further position pro-
vides EC L-compatibleoutputs (-0,9 Y
to —! 7V typ. open circuit}.
1} both outputs are
terminated by a 50-82
load,
TIMING
Repetition Rate: > 250 MHz to
<1 kHz in 6 ranges,
Period Jitter: < 0.1% + 50ps
Delay: < 2ns to > 0.0ms in 6 ranges
plus typ. 18ns fxd. with respect to
trigger output. |
Delay Jitter:<< 0.1% + 50ps
Double Pulse: Up to 125 MHz max.
(simulates 250MHz).Min pulse spacing
= Ans. |
Delay Duty Cycle: > 50%
Pulse Width: < 2ns to > 0.5ms in 6
ranges.
Width Jitter: < 0.1% +. 50ps
Width Duty Cycle: > 50%
Square Wave: A further position of
the Pulse Width switch provides
Square Wave output, {Delay and
double pulse are disabled, max. Rep.
Rate 250 MHz). Duty cycle is 50%
+ 10% up to 100 MHz, 50% + 15%
for > 100 MHz.
Trigger ‘Output: Negative going
Square Wave (50% duty cycle Тур.)
> 500mV from BOQ into 50%.
internal 500 load can be switched
off by slide-switch on PC-board.
Amplitude increases to = 1V into
— 509 up to 200 MHz.
Trigger Output Protection: Cannot .
be damaged by short circuit Or appli-
cation - of external *
EXTERNALLY CONTROLLED
OPERATION
Externai Input
Input Impedance: 5092 + 10%. DC.
coupied.
Maximum Input: + 6V
Trigger Level: Adjustable —1.0V to
+1.5V, | |
200mA.
a
2) the internal 50-02
source impedance is
selected.
Slope Control: Positive, negative or
manual selectable. in the MAN posit-
ion all ext, functions can De con-
trolled by push button. Burton
pushed in simulates an on-signal””.
Sensitivity: Sine-wave > 200mVpp,
pulses > 200mY,
Repetition Rate: 0 to > 250 MHz.
Ext-Controiled Modes
Ext. Trigger: There are approximately
7ns delay between the external input
and the trigger output. Rep.-Rate is
ext. controlled {is triggered by exter-
nal signal). Trigger output provides
the pulse-shaped input signal. Square
wave mode is disabled.
Synchronous Gating: Gating signal
turns rep. rate generator on. Last
pulse is of normal width even if gate
ends during the pulse. :
External Width: Output pulsa width
determined by width of drive input.
Rep. Rate and Delay are disabled.
Trigger output provides shaped input.
signal.
OPTIONS
Option 807 Front Handle Kit
Option 908 Rack Flange Kit
Option 909 Rack Flange plus Front
| | Handle Kit
Option 910 Additional instrument
Manual
GENERAL
Power Requirements: 100V 120V,
: 220V, 240V (+5%, — 10%) 48 — 440
“447; Power consumption 85VA max .
Weight: Net 79 kg (1/44 Ibs),
shipping 8.9 kg (19.63 65).
Dimensions: 476mm wide, 145mm
high, 380mm deep (16 3/4 ms, x
511/16 ins. x 15 ins).
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- SECTION 2—
INSTALLATION—
2—1 GENERAL 2-6 Power Cords
2—2 Initial Inspection 2-7 The instrument-is supplied with one of the
| power cords shown in Figure 2-3.
2—3 Inspect the instrument and accessories for
nhysical damage, and if damage is evident, refer to para-
graph 2—19 for the recommended claim procedure and
repacking information. -
2-4 - Accessories
2-5 The following accessories are supplied with
the standard instrument (Figure 2-1):
HP Part Number
2110—0007
2110—0202
see Figure 2-3 |
1A fuse (for 220/240V operation}
2A fuse {for 110/120V operation)
Power cord
Operating and Service Manual -
For an additional manual, order option 910.
Handies are rack mounting flanges are delivered with the
instrument only if the appropriate option (Figure 2—2)
is ordered.
2-8 INSTALLATION
2-9 Power Cord
2-10 - The 3-wire power cable supplied with the
8016A, when connected to the appropriate power out-
let, grounds the instrument cabinet and panels. To pre-
serve this safety feature when operating the instrument
from an outlet without a ground connection, use an
appropriate adapter and connect the ground lead
(green/yellow) to an external ground.
2-11 HH the plug on the cable does not fit your
power outlet, then cut the cable at the plug end and
connect a suitable plug. The plug should meet local
safety requirement and include the following features:
a. Minimum current rating of 2A
b. Ground connection
c. Cable clamp
The colour coding used in the cable will depend on the -
cable supplied (see Figure 2—3).
SCHUKO TYPE
HP Part No. 8120-1689
NEMA TYPE
HP Part No. 8120-1348
LINE = BLACK
NEUTRAL = WHITE
GROUND = YELLOW/GREEN
LINE = BROWN
NEUTRAL = BLUE
GROUND = YELLOW/GREEN
USED IN AUSTRALIA
HP Part No, 8170-1369
BRITISH STANDARD TYPE
HP-Part No. 8120-1351
LINE = BROWN
NEUTRAL = BLUE
“ GROUND = YELLOW/GREEN
LINE = BROWN
“NEUTRAL = BLUE
GROUND = YELLOW/GREEN
Figure 2-3. Power Cords
2—2
WARNING
To avoid the possibility of injury or death, the following
precautions must be followed before the instrument is
switched on:
a. If this instrument is to be energized via an auto-
transformer for voitage reduction, make sure that the
ground connection is not interrupted.
b. The power cable plug shall only be inserted into a
socket outlet provided with a protective earth contact.
The protective action must not be negated by the use
of an extension cord without a protective conductor
(grounding).
с, The safety check {Table 5-27) shall be executed
before connecting the instrument to the supply.
2-12. Power Source requirements
2-13 The instrument will operate from nominal
ac line supplies of 100V, 120V, 220V or 240V (10%, +
5%) at 48 Hz to 66 Hz. Two switches on the rear panel
allow one of the four voltages to be selected.
| 220V <- 1A -> 240V
Figure 2-4, Switch Settings for the various Norminal
Powerline Voltages
CAUTION
Before appiving power to the instrument, |
check on the rear panel that the switch is
set in accordance with local supply condi-
tions, '
2—14 To check the power requirements proceed as
follows:
a. Remove the fuse and check its vaiue:
for 220V/240V operation TA |
for 100V/120V option 2A
‘b. Check that the line selector switch
positions corresponds to the focal suppiy
voltage. 1f they do not correspond use a
screwdriver to change the switch positions.
с. Insert the correct fuse into the fusehoider.
d. Connect the power cable to the rear con-
nector.
2-15 Temperature Requirements
2-16 The instrument operates within specifi-
cations when the ambient temperature is between 0°C
(32°F) and 50°C {122°F). The word generator may be
stored between —40°C {—40°F) and 75° (1679 F).
9-17 PRACK MOUNTING
2-18 Figure 2--2 shows the possible handle/rack-
mounting configurations. if handles are fitted and subse
quently need to be removed, the plastic trim must first
be taken off as shown in Figure 2-5.
wr Lift a corner of the plastic trim with a screw-
driver and give a sharp tap in the direction of
the arrow.
Figure 2-5. Removing Plastic Trim
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2-19 CLAIMS AND REPACKAGING
2—20 Claims for Damage
2—21 If physical damage is evident or if the instru-
ment does not meet specification when received, notify
the carrier and the nearest Hewlett-Packard Saies/Service
Office. The Sales/Service Office will arrange for repair or
replacement of the unit without waiting for settlement
of the claim against the carrier,
2—22 Repackaging for Shipment
and Storage
2—23 If the instrument is to be shipped to a Hew-
lett-Packard Sales/Service Office, attach a tag showing -
owner, address, mode! and serial number, and the repair
required, The original shipping carton and packaging
material may be re-usable but the Hewlett-Packard
Sales/Service Office will also provide information and
recommendations on materials to be used if the original
packing is not available or re-usable.
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SECTION 3-—
3-1 GENERAL
3-2 This section is divided into two parts, The
first part gives some general notes on the operation of
the 8082A together with operating instructions for each
of the four operating modes:
NORM operating mode
EXT WIDTH operating mode
GATE operating mode
EXT TRIG operating mode
Full setting-up instructions are given for Normal mode
followed by any changes in control settings required for
the other three modes. Stylized waveforms are given for
cach mode to show the resuitant pulse shapes. For ease
SLOPE/POLAMITY -
RES POS MAN
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EXT. INFLIT LEVEL EXT, INAUT LEVEL
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OPERATING INSTRUCTIONS—
of operation the instructions will refer to Figure 3—1
which shows the controls identified by a reference num-
ber in a circle. The same reference numbers are used in
the text when each control is mentioned.
3—3 — The second part of this section gives appli-
cations information.
EXTERNAL INPUT
CHARACTERISTICS
3-4
3—5 The SLOPE/POLARITY switch determines
whether a rising (POS) or falling (NEG) signal will trigger
or gate the external input on. Figure 3—2 shows the effects
of these controls in the External Width mode,
SLOPE/POLASITY
MEE POS MAN
Ne: ел E
AE END TRIGGER LEVEL
E Im 0 ABJUSTAILE TO
pere LILA ANY LEVEL IN
ap A пе THIS REGION
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OUTPUT WHEN
EXT INPUT LEVEL
SET TO — 16V
OUTFUT WHENE
EXT IMPLY LEVEL
ЗЕТ ОТО +18 >
NOTE: There iy a fixeg celay of € Tdi after the input resches the trigger
level Delors the ouipul responds,
Figure 3-2. Effect of External input Controis
3-2
3-6 Any external input pulses must have an ampli- PULSE PERIOD
tude of at least 200mV peak-to-peak and must be at least a M ‘
Ins wide at the level at which triggering is to occur. PULSE DELAY ve |
3-7 If the SLOPE/POLARITY switch is set to
MAN, the external signal can be simulated by pressing
the MANUAL pushbutton. This button provides a means
of initiating a single pulse {EXT TRIG mode) each time
‘the button is pressed, a train of pulses {GATE mode)
while the button is pressed, or a pulse whose width is equal
to the time the button is pressed (EXT WIDTH model.
3-8 SQUARE WAVE OPERATION
3-9 There isa Square Wave facility on the 8082A
which produces a square wave output of 50% duty cycie
“in NORMAL mode. If Square Wave is selected in Exter-
nal Trigger or External Width modes, the output is a puise
shaped version of the trigger input {the output waveforms
are the same as for External Width mode, see Figure 3—4).
if Square Wave is selected in Gate mode, the output isa
gated square wave, the repetition rate of which is set up
on the pulse period controls.
3-10 QUTPUT AMPLITUDE CONTROLS
3-11 Vernier
3-12 Because the amplitude vernier is common to
both outputs, the amplitude relationship of one output
to the other is 1:1, 1:2 ок 1:5.
3-13 ECL Outputs
3-14 To obtain normal and complement ECL com-
patible puises from the two outputs, gither one or both
amplitude range switches should be set to the ECL posi-
tion. The ECL levels supplied are —0.9V to —1.7V into
an open circuit, i.e. without an external 50 ohm load.
These output levels can be altered by changing the vaiues
of resistors R 5 (ECL amplitude) and R60 (ECL—DC off
set} on board A5 (Amplitude Vernier and DC Offset
board).
3-15 INCOMPATIBLE CONTROL SETTINGS
3-16 When operating the 8082A, the layout of
the Pulse Period, Delay and Width controls helps to avoid
incompatible settings as shown in Figure 3-3. Generally,
the Pulse Period control should be farthest right but the
controls can all be in a straight vertical line if the Pulse
Period vernier is more clockwise than the other two ver-
niers.
_— AREA
PULSE WIDTH
|
Figure 3—3. Positioning of Controls
3-17 NORM OPERATING MODE
3-18 In this mode the 8082A requires no external
trigger signal to produce an output. Pulse rate, width,
delay, transition times, amplitude and offset are all ad-
justed by the front panel controis.
3-19 The initial settings (listed below) are given
to obtain a normal pulse waveform (Figure 3—4) for
someone unfamiliar with the operation of the 8082A.
Both pulse outputs and the trigger output should be
connected to a high-frequency oscilloscope using a
50 ohm system. The oscilloscope {an HP 180C main-
frame with 1810A plug-in ar similar T GHz bandwidth
sampling oscilloscope) should be set with the sweep
time at 0.64s/cm and with the sensitivity at 200mV/em.
LINEGO) ON
PULSE” PERIOD(1) 1104
VERNIER(2) Mid-range
PULSE DELAY (4) 2n—Bn
VERNIER (5) | CCW (2n)
PULSE WIDTH 50n-— 5H
VERNIER cw 1.50)
NORMAL /DOUBLE PULSE switch (3) NORMAL
Mode Switch NORM
TRANSITION TIME 50n— 5H
LEADING EDGE (11 Mid-range
TRAILING ED Mid-range
AMPLITUDE 1.0-2.0
AMPLITUDE (14 1,0—2.0
VERNIER CCW (1.0)
OFFSET ON/OFF switch(17) OFF
NORM/COMPL switch NORM
NEG/POS switch POS
OB MN
Te
mw
fe
a ES EL И EEES CEE EU UE bw
+1 Г
OV ———
оу —— —— — — = ===
— — # —— # LH ——— — = МНЕ са
TRIGGER
OUTPUT (-)
Figure 3-4, Pulse Output in NORM Mode
3-20 EXT WIDTH OPERATING MODE
3-21 in External Width mode, the pulse repetition
rate and width are determined by the repetition rate and
width (at the threshold set by the EXT INPUT LEVEL
control) of an externally applied signal. In EXT WIDTH
mode the PULSE PERIOD controls, the PULSE DELAY
controls, the PULSE WIDTH controls and the DOUBLE/
NORMAL PULSE switch have no effect on the puise
output. To obtain an output similar to that in Figure
3-8, adjust the controls as shown below. It is assumed
that the controls are already set-up as described above
for a Normal pulse; therefore only the alterations to these
control settings will be given,
a. Set the Mode switch (7) to EXT WIDTH,
b. Apply an external trigger to the EXT
INPUT (23 . The input should have the
following characteristics:
Pulse shape — sine or square wave
Amplitude — between 200m V and 6V
Frequency — 14kHz |
с. Set the EXT INPUT LEVEL (6) control
as required to vary the switching threshold.
d. Set the SLOPE/POLARITY switch as re-
quired to trigger off the rising (POS) or falling
(NEG) edge of the trigger.
EXTERNAL
INPUT
SIGNAL
TRIGGER
OUTPUT
Р1ХЕр —еер ре
DELAY |
1V {+705} |
PULSE |
TPU
QUTPUT ov
Figure 3-5. Pulse Output in External Width Mode
3—4
3-22 GATE OPERATING MODE the pulse. To obtain an output similar to that in Figure
3-8, adjust the controls as shown below, lt is assumed
3-23 in Gate mode the repetition rate is defined that the controls are already set-up as described above for
by the rate controls but no output occurs until the vol- | à puise in External Width mode; therefore only the alter-
tage of an externally applied signal rises above {SLOPE/ | ations to these controls settings will be given, Switching
POLARITY switch set to POS) or falls below (SLOPE/ to External Width mode when in Gate mode can be used
POLARITY switch set to NEG) the level set on the to check for correct functioning of the gate signal.
EXT INPUT LEVEL control. The last pulse of a ‘burst’
is always of correct width even if the gate closes during a. Set the Mode switch © to GATE,
TRIGGER
LEVEL
EXTERNAL
INPUT
SIGNAL
FIXED ii] sg
DELAY (17ns) + ji
EEE 0 LILI
Figure 3--6. Pulse Output in Gate Mode .
OUTPUT NL TLL
OUTPUT | |
1
| .
}
}
3-24 EXT TRIG OPERATING MODE below. It is assumed that the controls are already set-up
as described above for a pulse in Gate mode; therefore
3-25 in External Trigger mode the puise and trig- oniy the alterations to these control settings will be given,
ger repetition rates are determined by the repetition rate
of an externally applied signal, To obtain an output simi-
far to that in Figure 3—7, adjust the controls as shown a. Set the Mode switch (7) to EXT TRIG,
TRIGGER LEVEL
EXTERNAL +0,5V
INPUT SIGNAL OV
TRIGGER Ov +
OUTPUT ;
|
tpn] [oot FIXED DELAY (17ns)
|! + VARIABLE DELAY a
PULSE | | |
OUTPUT ov
Figure 3-7. Pulse Output in External Trigger Mode
pres
Li
a т т р
gt
Ta
wo
T# PEN
TE
(IE 6
lt A
er
3-26 APPLICATIONS NOTES
3—27 The following section indicates some appli-
cations of the 8082A.
3—28 Digital Applications
3-28 The 8082A can be used to test the following
digital integrated circuit (IC) logic families at their normal
operating speeds.
Propagation delay per gate
RTL T2ns . 27ns
DTL a 30ns
TIL | ... 12ns
Schottky TTL | Ins
ECL (including MECL HI) Ins — dns
For convenience of operation a special ECL output is
available on the 8082A. This means that by simply sett-
ing either amplitude range switch to the ECL position, an
output pulse width a voltage swing of —0.9V to —1 TV
is produced into an open circuit. |
When using the 8082A to test any of the above logic
families, particularly the fast MECL III logic, it is im
portant to operate with a 50 ohm transmission system.
The coaxial cable does not need to be terminated at the
IC and by a 50 ohm resistor: the internal 50 ohm ter-
mination of the 8082A is of sufficiently high quality to
provide a clean pulse shape in almost all cases (see para-
graph 3-31) without an external termination, even at
the fastest transition times. This has the advantage that
it enables the 50 ohm coaxial cable to be soidered
directly to the pins of the IC under test without requiring
а 50 обт terminating resistor. It should be noted, how-
ever, that when no external termination is used, no
connections can be made at any intermediate point
along the transmission cable, For example, suppose the
pulse on leaving the 8082A has 2V amplitude across
an effective 25 ohms (50 ohm internal termination in
paraliel with 50 ohm cable}; when the pulse reaches the
IC its amplitude is doubled to 4V {open end reflection).
This 4V is reflected back along the cable and is absor-
bed by the 50 ohm termination in the 8082A with only
2% typical refiection at amplitudes up to 4V. The effect
of this action is to produce the stepped pulse shown in
figure 3—8 at any intermediate point along the cable,
ДМ -—m - Pulse at the internal
50 ohm load or along
2\у — = the cable.
ov |
i |
| |
| | avs
Pulse at the open
and of the coax
cable,
OV.
Figure 3—8. Stepped pulse with high-Z output
3-30 If a detailed analysis of IC waveshapes and
timings is to be made, a 1 GHz sampling oscilloscope
with a high impedance input probe should be used. The
probe shouid be connected at the IC pin and not at any
intermediate point along the 50 ohm cable.
3-31 If a number of 1C's on one PC board are
being driven from one point on the board and the
printed circuit track is more than 10em long, then an
external 50 ohm resistor at the end of the 50 ohm
system may be required to preserve the clean puise
shape at the IC input pins.
3-32 One point to remember, particularly when
testing 1ns ECL, is the loss of edge speed due to the
coaxial cable, However, the 8082A is fast enough to.
accommodate this edge speed degradation without ex-
ceeding the manufacturers specification. A 1.23 metre
cable is available as HP Accessory number 10503A,
3-33 When testing flip-flops (Motorola MC1666
for example}, two pulse generators are required, one to
provide the clock input and one to provide the data in-
put. One pulse generator is run in square wave mode
and the other is run in external trigger and double pulse
mode and is synchronized from the trigger output of the
first pulse generator {Figure 33}. Allowance must —
be made for the differential delay that will occur be-
tween the two outputs. This is caused by the fact that
there is an extra 7ns delay in the second 8082A (24ns
against 17ns) due to the delay between the trigger input -
and the trigger output. To preserve the correct timing
relationship, therefore, between the two sets of pulse
outputs, the data pulse output must be delayed by a
further 7ns. This can be achieved by increasing the length
of the data output transmission cable (delay is about Ens
per metre}. |
3—6 —
8082A
TRIGGER
QUTPUT QUTPUT
\ 17ns DELAY AD |
|
INSERT 7ns DELAY
SQUARE WAVE MODE
|
i
|
|
1 8082A | 1 =
EXT | | | |
INPUT OUTPUT - + В
| | DOUBLE PULSE MODE 6
® | ® > 7ns ¡¡ DOUE E POL © o
js cr arr
ï / | | I | | FLIP-FLOP
24ns DELAY |
Figure 3—9. Flip-Flop Test Circuit
3-34 The minimum set-up time required for swi-
tching the flip-flop from "0" to '3 lor vice versa) can be
measured as shown in Figure 3-10.
The puise delay controls of the clock output are siowly
decreased and becatise the output is in double pulse
form, only the second pulse in each case advances to-
FIRST 8082A
wards the leading edge of its data input {in this case
a'1'), The minimum set-up time is found mer the
flip-flop ceases to switch properly from ‘0° to’ . The
minimum set-up time for switching from “1° to pe can
then be found by switching to the complement of the
data input and repeating the exercise.
TRIGGER TT | |
OUTPUT | | | a
| "0" HOLD
| | | TIME
|
DATA
OUTPUT — À nie |
TT AAA 1
ii | 1" SET-UP
24ns | + TIME a
CLOCK DELAY i a | у |
OUTPUT | | “== |
| — i
|
аа чё = i
Figure 3-10. Flip-Flop Test Waveforms
LL
Li
mom om ww Emm
E
mow EEE
"AF
mm a
pa Y
FA
TE
Nr:
va CESA АНИМО
Sd SAT GE BRM RA
Thom SEEGER
wd 14€
ai
Pad
NARA
28
7
tai lus
1
que
¡al
434)
sa
3-35 The clock pulse transition times can be ad:
justed to observe the variation in the propagation delay
of the flip-flop or to simulate edge degradation caused
by a high fanout of the clock pulse line.
3-36 The 8082A can be used as a pulse shaper.
When set to external width mode, an external signal
(the output of a word generator for example) connec-
ted to the trigger input is available in pulse shaped form
at the pulse output. Adjusting the trigger ievel contro!
to the appropriate level helps to recover the shape of
even badly distorted pulses.
3-37 The 8082A can also be used to generate
noise pulses; the pulse width is set to minimum and the
amplitude to BV and then the transition times are in-
creased. This has the effect of reducing the pulse amv
plitude and, in fact , the transition times can be in-
creased until a spike of approximately Îns width and
800mV amplitude (ECL amplitude) is produced (see
Figure 3-11).
This can be set to the required de level using the
offset controls and connected to the logic circuit under
test to simulate noise, The amplitude and offset of the
noise spike can be varied.and their effect on the circuit
monitored.
prof AAA
1
—2 V
Figure 3—11. Noise Puises
3-38 Analog Applications
3—39 The 8082A can also be used effectively in
analog applications. Twisted pairs of transmission lines
and differential amplifiers can be tested using the normal
and complement outputs; the common amplitude
vernier is very useful in this application for varying the
amplitude of both outputs simuitaneousty. Trigger levels
of Schmitt trigger circuits can be tested using output
puises with very slow transition times {as slow as 0.5ms).
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