Features
• 24 dB Gain
• 5 dB Noise Figure
• Probe-Power Bias Connection
• Compact Size
Benchtop/General Purpose Use
Used alone on the bench, the Agilent 87405B
Preamplifier can be added to any application in which
additional gain and low noise are required. The compact and inexpensive 11899A probe power supply is a
suitable source of DC bias in remote applications.
The Agilent 87405B preamplifier brings reliable gain
and low noise figure to measurement systems to
improve overall system performance and reduce systematic errors. With its compact size and convenient
probe-power bias connection, the 87405B is ideal for
use as the front end preamplifier for a variety of
Agilent instruments such as the 8590E Series of
portable spectrum analyzers. The 87405B is the recommended preamplifier for use with the 8594E Noise
Figure Measurement Solution. The rugged design
along with its insertable configuration of connectors
makes the 87405B ideal for test port applications.
Agilent 87405B
Preamplifier 10 MHz to 4 GHz
Data Sheet
2
Improve Noise Figure Measurements
Add a preamplifier to noise figure measurement systems
to significantly lower system noise figure. The noise figure of the system is dominated by the noise figure of the
preamplifier
.
F
new
= F pa + F
sys
- 1
G
pa
Where F and G are noise figure and preamplifier gain,
both in linear terms
.
NF
sys
= 10 log (F
sys
) in dB
For systems having a single preamplifier, where the gain
of the preamplifier is greater than or equal to the spectrum analyzer noise figure, the system noise figure
approximately equals the noise figure of the pre-
amplifier.
Increase Sensitivity and Speed
Adding preamplifiers to measurement systems can
improve sensitivity for measuring low-level signals. Boost
the sensitivity of your Agilent spectrum analyzer 15 to
25 dB by using the 87405B Preamplifier. Alternatively,
better sensitivity can be traded for measurement speed.
Spurious tests often require narrow resolution bandwidths to reduce the noise floor of the analyzer, allowing
low-level signal detection. An analyzer with low noise
figure allows you to use a wider resolution bandwidth,
yet achieve the same sensitivity. Sweeptimes can
improve one hundred times for each decade increase in
bandwidth. The 87405B Preamplifier has gain and noise
figure characteristics that optimize dynamic range and
sensitivity.
Gain(dB)
28
0.01
1.0
2.0
3.0 4.0 5.0
6.0
Frequency(GHz)
Specification Typical
Output Power(dBm) @ 1 dB compression(dB)
12
11
10
9
8
7
6
5
4
3
2
0.01 0.5
Noise Figure(dB)
6
5
4
3
2
Specification Typical
Specification Typical
1.5
2
2.5
Frequency(GHz)
3.5 4 4.5
3
5
1
5.5
6
1
0
0.01
1.5
1
2.5
2
Frequency(GHz)
3.5
3
4.5
4
5.5
5
6
3
87405B Product Specifications
Frequency range 10-4000 MHz
Small signal gain 22-27 dB min-max
Gain flatness ±1.5 dB 10-4000 MHz
Output power (1 dB compression pt.) 8 dBm at 4 GHz
Noise figure 5 dB 10-4000 MHz
Third order intercept (TOI) 15 dBm typical
Harmonics 30 dBc typical
(@ +4 dBm output power)
Input VSWR 1.5:1 10-1000 MHz
1.7:1 1000-2000 MHz
2.1:1 2000-3000 MHz
2.2:1 3000-4000 MHz
Output VSWR 1.9:1 10-4000 MHz
Impedance 50 ohms nominal
Reverse isolation 40 dB typical
Survival input power (max) +10 dBm typical
Power dissipation 1.6 W nominal
Temperature (operating) 0 to +55 °C
(storage) -40 to +70 °C
EMC
IEC 61326:1997/
EN 61326:1997
CISPR 11:1997
This ISM device complies with Canadian ICES-001.
AC line harmonic current emissions IEC/EN 61000-3-2
Line voltage interrupt (1 cycle, 100%) IEC/EN 61000-4-11
Surge test (1.2 x 50us, 0.5/1 kV) IEC/EN 61000-4-5
Electrical fast transients IEC/EN 61000-4-4
Radiated emissions CISPR 11, Class A
Radiated immunity (3 V/m, 80-1000 MHz) IEC/EN 61000-4-3
Conducted emissions CISPR 11, Class A
Conducted immunity (3 V, 0.15-80 MHz) IEC/EN 61000-4-6
ESD (4 kV contact, 8 kV air discharge) IEC/EN 61000-4-2
General Specifications
Bias voltage and current 15 ±6% Vdc @ 105 mA nominal
Connectors RF Type N(f) in, N(m) out
DC Probe Power Connector (f)
Weight net 233 g, shipping 546 g
Environmental Information
Moisture resistance 65 °C at 95% RH for 10 days per
Mil-Std-883C method 1004.5
Altitude, non-operating 15,000 meters per Mil-Std-883C
method 1001-C
Reliability
Random vibration 5.2 G (rms) to 2000 Hz per Mil-Std-883C
method 2026-11A
Shock 1500 G (peak), 0.5 ms per Mil-Std-883C method 2002.3-B
Operating temperature (0 to +55 °C) Class B2/B1 HPETM 757
Storage temperature (-40 to +70 °C) Class B HPETM 757
5 Day Op. humidity cycle (40C/95% RH) Class A2, B1, B2 HPETM
758, 4.6
Product safety evaluation CSA 61010-1
Specifications describe the instrument’s warranted performance
over the temperature range 0 °C to +55 °C (unless otherwise
noted). All specifications apply after the instrument’s temperature has been stabilized after one hour continuous operation.
Typical characteristics are intended to provide information useful
in applying the instrument by giving typical but nonwarranted
performance parameters. These are denoted as “typical” or
“nominal” and apply over the temperature range 0 °C to +55 °C.
Caution: Electrostatic Discharge (ESD) can damage or destroy
electronic compnents. It is recommended that this preamplifier,
like other electronic components, be installed and operated at a
static-free workstation or in an environment where precautions
against ESD have been implemented.
Ordering Information
87405B Preamplifier 10 MHz to 4 GHz
11899A Probe Power Supply (must order one option)
Option 11899A-100 100 V operation
Option 11899A-120120 V operation
Option 11899A-220220 V operation
Option 11899A-240240 V operation
Related Literature Pub. Number
11899A Probe Power Supply
Technical Specifications 5091-0754E
Noise Figure Measurement Accuracy
Application Note 57-2 5952-3706E
41.94
(1.65)
109.54
(4.31)
28.0
(1.1)
28.0
(1.1)
Agilent 87405B
Preamplifier 10 MHz to 4 GHz
General Specifications
Weight: net 233 g, shipping 546 g.
Cable nominal length is 460 mm (18.11 inches).
Note: Dimensions are in mm (inches) nominal, unless otherwise specified.
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© Agilent Technologies, Inc. 2002, 2003
Printed in USA June 18, 2003
5988-8452EN
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