Avtech AVB1-3 User manual

INSTRUCTIONS
MODEL AVB1-3
50 VOLTS PEAK-TO-PEAK
400 TO 900 MHz
MONOCYCLE GENERATOR
SERIAL NUMBER: ____________
A V T E C H E L E C T R O S Y S T E M S L T D .
N A N O S E C O N D A V E F O R M E L E C T R O N I C S
S I N C E 1 9 7 5
P.O. BOX 265
OGDENSBURG, NY
U.S.A. 13669-0265
TEL: [phone] (USA & Canada) or [phone] (Intl)
FAX: [phone] (USA & Canada) or [phone] (Intl)
[e-mail] - http://www.avtechpulse.com/
X
BOX 5120, LCD MERIVALE
OTTA A, ONTARIO
CANADA K2C 3H4

ARRANTY
Avtech Electrosystems Ltd. warrants products of its manufacture to be free from
defects in material and workmanship under conditions of normal use. If, within
one year after delivery to the original owner, and after prepaid return by the
original owner, this Avtech product is found to be defective, Avtech shall at its
option repair or replace said defective item. This warranty does not apply to
units which have been dissembled, modified or subjected to conditions
exceeding the applicable specifications or ratings. This warranty is the extent of
the obligation assumed by Avtech with respect to this product and no other
warranty or guarantee is either expressed or implied.
TECHNICAL SUPPORT
Phone: [phone] (USA & Canada) or [phone] (International)
Fax: [phone] (USA & Canada) or [phone] (International)
E-mail: i[email protected]
orld ide eb: http://www.avtechpulse.com
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TABLE OF CONTENTS
WARRANTY......................................................................................................................2
TECHNICAL SUPPORT...................................................................................................2
TABLE OF CONTENTS....................................................................................................3
INTRODUCTION...............................................................................................................4
AVAILABLE OPTIONS.....................................................................................................4
SPECIFICATIONS............................................................................................................5
GENERAL INFORMATION..............................................................................................6
BASIC TEST ARRANGEMENT.............................................................................................. 6
CONTROLS............................................................................................................................. 7
TRIMPOT ADJUSTMENTS.....................................................................................................7
OTHER GENERAL OPERATING NOTES..............................................................................7
PERFORMANCE CHECK SHEET....................................................................................9
Manual Reference: /fileserver/officefiles/instructword/avb/AVB1-3,edition2.odt.
Last modified August 23, 2010.
Copyright © 2010 Avtech Electrosystems Ltd, All Rights Reserved.
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INTRODUCTION
The AVB1-3 monocycle generator allows the generation of high-speed monocycle
waveforms, with peak-to-peak amplitudes of ≥ 50 V into 50Ω loads. The amplitude is not
adjustable.
The monocycle center frequency is adjustable over the range of 400 to 900 MHz. See
the online application note, "TB13 - How Is the Center Frequency of a Monocycle
aveform Measured?" at http://www.avtechpulse.com/appnote/techbrief13/ for
information about center frequency measurements.
The AVB1-3 can operate at repetition rates of up to 100 kHz. An externally-generated
TTL-level signal is required to trigger the AVB1-3.
The AVB1-3 is powered by +15V DC.
The output is designed to drive 50Ω loads. (A 50Ω load is required for proper operation.)
The output is AC-coupled.
This instrument is intended for use in research, development, test and calibration
laboratories by qualified personnel.
AVAILABLE OPTIONS
The AVB1-3 is available with these options:
-AK1 Option: an accessory kit that consists of three SMA, 18 GHz, 2 att attenuators
(10, 20 & 30 dB) and two 50 Ohm, 1 GHz, 1 att feed-through terminators (one SMA,
one BNC).
-AK8 Option: an accessory kit that consists of one 12-inch SMA-M/SMA-M PE-
SR405FL coaxial cable, one 12-inch SMA-M/SMA-M RG-316 coaxial cable, one 36-inch
SMA-M/SMA-M RG-316 coaxial cable, one 24-inch SMA-M/BNC-M RG-316 coaxial
cable, one 36-inch BNC-M/BNC-M RG58C/U coaxial cable, one SMA-F to BNC-M
adapter, one SMA-M to BNC-F adapter, one SMA-F to SMA-F adapter, and one SMA-F
to solder cup adapter.
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SPECIFICATIONS
Model: AVB1-3
Center frequency: 400 - 900 MHz, tunes full range1
Amplitude: (to 50 Ohms2) ≥ 50 Vpp, fixed (not adjustable)
Maximum repetition rate: 100 kHz
Spurious signals: -20 dB with respect to peak
Propagation delay: ≤ 50 ns (Ext trig in to pulse out)
Jitter: ± 15 ps (Ext trig in to pulse out)
Trigger required: +5 Volts, 50 to 500 ns (TTL)
Connectors: Out: SMA, In: SMA, Power: Solder terminals
Power requirements: +15 Volts, 400 mA
Dimensions: 43 x 76 x 152 mm (1.7” x 3” x 6”)
Chassis material: cast aluminum, blue enamel
Temperature range: +5°C to +40°C
1) May be tuned either by front-panel one-turn control or by applying 0 to +10 Volts DC to a solder terminal. Input impedance greater than 10 kilohms.
2) A 50 Ohm load is required. Other loads may damage the instrument. Consult Avtech ([e-mail]) if you need to drive other load impedances.
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GENERAL INFORMATION
BASIC TEST ARRANGEMENT
The AVB1-3 should be tested with a sampling oscilloscope with a bandwidth of at least
2 GHz to properly observe the high-speed waveform. A typical test arrangement is
shown below:
The AVB1-3 generates a positive pulse and a negative pulse internally. These are
added together in the pulse combiner located on the top of the main chassis. The OUT
P to P IN and OUT N to N IN cables shown in the diagram above are preinstalled on the
AVB1-3 (and should never be removed).
The attenuators are required to prevent damage to the sampling oscilloscope. A 40 dB
attenuator with sufficient voltage rating should be used on the main output.
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AVTECH
AVB1-3
OUT N
SAMPLING
OSCILLOSCOPE
BW > 5 GHz
50 OHM INPUT
TRIG
TTL-LEVEL
LOGIC
PULSER
TRIG
MAIN OUTPUT
SYNC OUTPUT
40 dB
ATTENUATOR
ALL CABLES: 50 OHM COAXIAL
+3V to +5V (TTL)
0V
P ≥ 50 ns
PRF ≤ 100 kHz
+15V DC
PO ER
SUPPLY
50Ω FEED-THROUGH
TERMINATOR
(OPTIONAL, BUT
RECOMMENDED)
OUT P
P IN N IN
OUT N/C
T P
50Ω TERMINATOR
(PASTERNACK PE6071
OR EQUIVALENT, INCLUDED)

CONTROLS
The “OUT N” and “OUT P” SMA connectors are connected to the pulse combiner on the
top of the main module, through factory-installed cabling.
The external trigger is applied to the TRIG input connector. The input impedance is ≥
1kΩ. A feed-through 50 terminator is recommended for maximum signal integrity.
hen the INT / EXT switch is in the INT position, the center frequency of the output
waveform is controlled by the FREQ potentiometer. This potentiometer may be adjusted
with a screwdriver.
hen the INT / EXT switch is in the EXT position, the center frequency of the output
waveform is controlled by a voltage applied to the solder terminal adjacent to the INT /
EXT switch. This user-generated voltage may be adjusted from 0 to +10V,
corresponding to a center frequency range of 400 to 900 MHz.
The +15V and GND power terminals are on the opposite face of the module.
TRIMPOT ADJUSTMENTS
The ten-turn trim pots P and T control the pulse widths (P ) and pulse separation (T)
of the positive and negative components of the monocycle waveform. At the time of
shipping, these controls were set to provide optimal output and should not require any
further adjustment.
OTHER GENERAL OPERATING NOTES
1) The bandwidth capability of components and instruments used to display the
monocycle generator output signal (attenuators, cables, connectors, etc.) should
exceed 5 GHz.
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FREQ
OUT
P
INT
OUT
N
EXT
TRIG

2) The use of a 40 dB attenuator will ensure a peak input signal to the sampling
scope of less than one volt.
3) The module shown should be bolted to a heat sink capable of dissipating at least
5 atts.
4) Various settings are sensitive to variations in the +15 VDC voltage supply and
therefore a well-regulated DC supply is required.
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PERFORMANCE CHECK SHEET
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