Atec Agilent-87405A User Manual

Features
• 24 dB Gain
• 6.5 dB Noise Figure
• Probe-Power Bias Connection
• Compact Size
Benchtop/general purpose use
Used alone on the bench, the Agilent Technologies 87405A 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 87405A 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 87405A 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 87405A 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 87405A ideal for test port applications.
Agilent 87405A Preamplifier 10 MHz to 3 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 preamplifier.
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 87405A 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 fold for each decade increase in bandwidth. The 87405A preamplifier has gain and noise figure characteristics that optimize dynamic range and sensitivity.
Gain (dB)
28
27
26
25
24
23
22
21
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
Noise Figure (dB)
10
9
8
7
6
5
4
3
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
2
1
Output Power (dBm) @ 1 dB compression (dB)
12
11
10
9
8
7
6
5
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
4
3
3
87405A product specifications
Frequency Range 10-3000 MHz
Small Signal Gain 22-27 dB min-max
Gain Flatness ±1.25 dB 50-3000 MHz
±2.0 dB 10-3000 MHz
Output Power (1 dBC) 4 dBm
Noise Figure 6.5 dB 10-2000 MHz
7.5 dB 2000-3000 MHz
Third Order Intercept (TOI) 15 dBm typical
Harmonics 20 dBc typical (@ +4 dBm output power)
Input VSWR 1.5:1 10-1000 MHz
1.7:1 1000-2000 MHz
2.0:1 2000-2900 MHz
2.2:1 2900-3000 MHz
Output VSWR 2.0:1
Impedance 50 ohms nominal
Reverse Isolation 60 dB typical
Survival Input Power (max) +13 dBm typical
Power Dissipation 1.2 W nominal
Temperature (operating) 0 to +55°C
(storage) -40 to +70°C
Specifications describe the instrument’s warranted performance over the tempera-
ture 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 compo-
nents. 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.
General specifications
Bias Voltage and Current 15 ±6% Vdc @ 80 mA
nominal
Connectors RF Type N(f) in, N(m) out
DC Probe Power Connector (f)
Weight net 270 g, shipping 510 g
Environmental information
EMC IEC 801-2/1991 IEC 801-4/1988
IEC 801-3/1984 CISPR-11/1990
Moisture Resistance 65°C at 95% RH for 10 days per
Mil-Std-883C method 1004.5
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
Altitude, non-operating 15,000 meters per Mil-Std-883C
method 1001-C .
Ordering information
87405A Preamplifier 10 MHz to 3 GHz
11899A Probe Power Supply (must order one option) Option 100 100 V operation Option 120 120 V operation Option 220 220 V operation Option 240 240 V operation
Related literature Pub. Number
8590E Series Technical Data Sheet 5091-3271E
11899A Technical Data Sheet 5091-0754E
Noise Figure Measurement Accuracy
Application Note 57-2 5952-3706
57.3
124.9
28.0
28.0
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Product specifications and descriptions in this document subject to change without notice.
© Agilent Technologies, Inc. 1999, 2002, 2003 Printed in USA, February 3, 2003
5091-3661E
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