Keysight 11590B Service manual

Keysight
11590B
Bias Network
Operating and
Service Manual

Notices
©Keysight Technologies 1995 - 2015
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Manual Part Number
11590-90020
Edition
January 2015
Supersedes: January 1995, April 2014
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
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Safety Notices
CAUTION
A CAUTION notice denotes a haz-
ard. It calls attention to an operat-
ing procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
WARNING
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly per-
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tions are fully understood and met.

11590B Operating and Service Manual 1
11590B Bias Network
General Information
This Operating and Service Manual contains information required to install, operate and test the 11590B and
11590B Option 001 bias networks. The 11590B is equipped with Type-N female connectors and operates to
12.4 GHz. The 11590B Option 001 is equipped with precision 7 mm connectors and operates to 18.0 GHz.
Specifications
Instrument specifications are listed in Ta b l e 1 . These specifications are the performance standards or limits
against which the instrument is tested.
Table 1 Specifications
Electrical
Frequency Range
Standard 0.1 to 12.4 GHz
Option 001 0.1 to 18.0 GHz
Impedance 50 ohms nominal
Port Match (both ports); Minimum Return Loss
Standard
0.1 to 1.0 GHz 16 dB
1.0 to 12.4 GHz 19 dB
Option 001
0.1 to 1.0 GHz 16 dB
1.0 to 12.4 GHz 19 dB
12.4 to 18.0 GHz 14 dB
Insertion Loss; Maximum
Standard
0.1 to 1.0 GHz 1.0 dB
1.0 to 12.4 GHz 0.8 dB
Option 001
0.1 to 1.0 GHz 1.0 dB
1.0 to 12.4 GHz 0.8 dB
12.4 to 18.0 GHz 1.2 dB

2 11590B Operating and Service Manual
Description
The 11590B bias network provides a means of supplying dc bias to the center conductor of a coaxial line and
thus to a biasable component or device (such as a transistor), while blocking the dc bias from the input RF
circuit.
A schematic diagram of the 11590B is shown is Figure 1. The capacitor in the RF input arm acts as a dc
block/high pass filter. The vertical arms are identical and act as bias/bias sense arms. Because the
BIAS/BIAS SENSING port draws no current (it is connected to a high impedance voltmeter), the voltage
measured is identical to the voltage at the RF and Bias Output. To double the maximum current handling
capability, both BIAS/BIAS SENSING ports may be used for bias input.
A vertical arm is comprised of a series inductance and shunt capacitance which act together as a low pass
filter. The ferrite beads and R-C filter decouple the power supply from the RF section and help to reduce the
possibility of inductance related oscillation.
Maximum Bias Voltage 100 Vdc
Maximum Bias Current
(each bias port)
500 mA
DC Resistance from Bias
Port to Output Port at 23 °C
(typical)
3.0 ohms
General
Operating Temperature 0 to 55°C
RF Connectors (non-hermetic)
Standard Type-N female
Option 001 Precision 7 mm
Bias Connector
(non-hermetic)
BNC female
Net Weight 0.30 kg (0.7 lbs)
Dimensions
In millimeters 54 x 51 x 28
In inches 2.2 x 2 x 2.1
Table 1 Specifications

11590B Operating and Service Manual 3
Figure 1 Schematic Diagram
Installation
Initial Inspection
Inspect the shipping container for damage. If the shipping container or cushioning material is damaged, it
should be kept until the contents of the shipment have been checked for completeness and the instrument
has been checked mechanically and electrically. Procedures for checking electrical performance are given
under “PERFORMANCE TESTS”. If the contents are incomplete, if there is mechanical damage or defect, or
if the 11509B bias network does not pass the Performance Tests, notify Keysight Technologies –
see“Contacting Keysight” on page 8. If the shipping container is damaged, or the cushioning material shows
signs of stress, notify the carrier as well as Keysight. Keep the shipping materials for the carrier’s inspection.
The Keysight office will arrange for repair or replacement at Keysight’s option without waiting for claim
settlement.
Preparation For Use
Interconnections The 11590B bias network is connected in line with the device to be biased. The bias is
applied through either BIAS/BIAS SENSING port, and is sensed through the other BIAS/BIAS SENSING
port.
Mating Connectors The mating connectors for Type-N connectors are the opposite gender Type-N
connectors. Precision 7 mm connectors (Option 001) are genderless.

4 11590B Operating and Service Manual
Operating Environment
The instrument may be operated in environments within the following limits:
The instrument should be protected from temperature and humidity conditions which cause condensation
within the instrument.
Storage and Shipment
The instrument may be stored in environments within the following limits:
The instrument should be protected from temperature and humidity conditions which cause condensation
within the instrument.
Packaging
Tagging for Service If the instrument is being returned to Keysight for service, attach a tag indicating the
type of service required, return address, and model number. See“Contacting Keysight” on page 8.
Original Packaging Containers and materials identical to those used in factory packaging are available
through Keysight offices. Mark the container FRAGILE to ensure careful handling.
Other Packaging The following general instructions should be used for re-packing with commercially
available materials:
1. Wrap the instrument in heavy paper or plastic (If shipping to a Keysight office or service center, attach a
tag as explained previously).
2. Use a strong shipping container.
3. Use a thick layer of shock absorbing material 70 to 100 mm (3 to 4 inches) thick around all sides of the
instrument to provide firm cushioning and prevent movement inside the container.
4. Seal the shipping container securely.
5. Mark the shipping container FRAGILE to ensure careful handling.
6. In any correspondence, refer to the instrument by model number and full serial number.
Temperature 0° to +55°C
Humidity Up to 95%
Altitude Up to 7625 meters
(25,000 feet)
Temperature –40°C to +75°C
Humidity Up to 95%
Altitude Up to 7625 meters
(25,000 feet)

11590B Operating and Service Manual 5
Operation
Operating Instructions
Figure 2 shows the Keysight 11590B bias network connected in a typical measurement setup. Many other
applications are possible but not shown because the general method of setup and operation is the same.
The 11590B contains an in-line filter which will help prevent inductance related oscillations. However, to
eliminate the possibility of oscillation with bipolar transistors, it is recommended that the 11635A bias
decoupling network be used with the 11590B.
Figure 2 Typical Measurement Setup
Performance Tests
The procedures in this section tests the electrical performance of the 11590B using the specifications of
Ta b l e 1 as performance standards.
Test Record
Results of the performance tests may be tabulated on the Test Record at the end of the procedures.
Performance may be verified using either a vector or scalar network analyzer setup. Errors due to directivity,
source match, and return loss of the “opposite port” termination (and detector match in a scalar system) will
add uncertainties to your measurement. The most accurate method uses an error corrected instrument.
However, a scalar system will give acceptable results depending on the quality of the components.
The following general instructions apply to both vector and scalar network analyzers.
Return Loss Of Input and Output Ports (Port Match)
1. Connect the equipment for a standard reflection measurement.
2. Calibrate the system with the appropriate standards.
3. Connect the appropriate instrument port of the 11590B to the test port. Terminate the opposite port of
the 11590B with a 50 ohm load.

6 11590B Operating and Service Manual
NOTE The Return Loss of the load should be at least 20 dB better than the desired measurement
value.
4. Measure the port match. The specifications are as follows:
Insertion Loss
1. Connect the equipment for a standard insertion loss measurement.
2. Calibrate the system with a through line.
3. Replace the through line with the 11590B.
4. Measure the insertion loss. The specifications are as follows:
Adjustments
There are no mechanical or electrical adjustments on the 11590B bias network.
Port Match (both ports) – Minimum Return Loss
Standard
0.1 to 1.0 GHz 16 dB
1.0 to 12.4 GHz 19 dB
Option 001
0.1 to 1.0 GHz 16 dB
1.0 to 12.4 GHz 19 dB
12.4 to 18.0 GHz 14 dB
Insertion Loss – Maximum
Standard
0.1 to 1.0 GHz 1.0 dB
1.0 to 12.4 GHz 0.8 dB
Option 001
0.1 to 1.0 GHz 1.0 dB
1.0 to 12.4 GHz 0.8 dB
12.4 to 18.0 GHz 1.2 dB

11590B Operating and Service Manual 7
Replacement Parts
Inner Conductor Contact; Option 001
The center conductor collet (Figure 3) in the precision 7 mm connector, Keysight part number 1250-0907,
may be replaced using a special extractor tool, Keysight part number 5060-0370. Examine the collet with a
magnifying glass to determine if it is damaged. The collet must be free of burrs and the prongs must be
equally spaced. If the collet needs to be replaced, perform the following procedure:
1. Place the instrument so that the connector faces down.
2. Tap the connector lightly on the outside ring and the center conductor collet should protrude slightly.
3. Compress the handle of the collet extractor tool, causing the jaws to expand, and insert the tool into the
precision 7 mm connector.
4. Release the compression on the extractor tool, allowing the jaws of the tool to close on the center
conductor collet. Pull the tool straight out from the connector without twisting. The collet will come out
of the connector with the tool. Do not reuse the extracted collet.
5. To install a new center conductor collet, push the collet into the center conductor until it snaps into
place. No special tool is required for this operation.
Figure 3 Precision 7 mm Connector
Service
There are no serviceable parts in the 11590B bias network.