1
ORTEC MODEL 9306
1-GHz PREAMPLIFIER
1. DESCRIPTION
The ORTEC Model 9306 1-GHz Preamplifier is
optimized for fast timing and counting applications
with detectors that deliver pulses with ultra-fast rise
times. An output rise time of 350 ps and a non-
inverting gain of 100 make the Model 9306 ideal for
use with microchannel-plate photomultipliers,
microchannel plates, channeltrons, silicon diodes,
fast photomultiplier tubes, and electron multipliers.
The compact preamplifier case with captive power
cord permits close coupling to the detector to
minimize sensitivity to environmental noise.
To preserve the ultra-fast rise time, the Model 9306
is designed to accept and deliver signals on high-
quality, 50-ohm, coaxial cables with SMA
connectors and 50-ohm terminations. The input is
ac-coupled with a 50-ohm input impedance, and is
protected to a maximum of ±1 V. Two identical
outputs are provided for convenient, simultaneous
connection to two different instruments. Both
outputs are ac-coupled, short-circuit protected, and
capable of driving pulse amplitudes from 0 to
!
2 V
into 50-ohm loads.
The 1-GHz Preamplifier derives its +24
!
V dc power
from a NIM module or power supply via the captive
power cord and standard, 9-pin, D connector. The
ORTEC Model 4002P Portable Power Supply and
most NIM amplifiers provide the required power on
a compatible preamplifier power connector.
2. SPECIFICATIONS*
2.1. PERFORMANCE
All specification are measured with a pulser having
a pulse width of 2 ns FWHM, and a rise time of 150
ps. Where significant, the measurement is
corrected for the rise times of the pulser, coaxial
cable, and oscilloscope. The specifications are
identical for OUTPUTS 1 and 2.
GAIN Nominally 100 (50 to 150), non-inverting,
into a 50-ohm output load.
OUTPUT RISE TIME Typically 350 ps.
BANDWIDTH (3 dB) Typically 100 kHz to 1 GHz.
NOISE <100
:
V rms equivalent input noise over
the full bandwidth.
2.2. INPUTS AND OUTPUTS
INPUT SMA input connector with 50 ohms input
impedance (ac-coupled). Input protected to a
maximum of ±1 V.
*Specifications subject to change without notice.
OUTPUT 1 SMA output connector provides a
linear output range from 0 to
!
1.75 V and a
maximum output of
!
2 V into a 50-ohm load.
Output impedance is 50 ohms, ac-coupled, and
short-circuit protected. The unused output must be
terminated with a 50-ohm load for proper operation
of the other output. An optional SMA 50-ohm
terminator is available for this purpose.
OUTPUT 2 Identical to OUTPUT 1
POWER Input power supplied through a captive
cable (length: 3 m) with a standard preamplifier
power connector (9-pin D type). Compatible with
ORTEC instruments that provide a preamplifier
power connector.
2.3. ELECTRICAL AND MECHANICAL
POWER REQUIRED +24 V at 200 mA. Captive
power cord with standard 9-pin D connector derives
power from any ORTEC instrument equipped with
the standard Preamplifier Power plug (e.g.,
spectroscopy amplifiers, 4002P Portable Power
Supply, etc.).
Summary of Contents for 9306
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