Keysight 11612B Service manual

Operating and
Service Manual
Keysight
11612B
Bias Network

Notices
© Keysight Technologies, Inc.
1989–2021
No part of this manual may be
reproduced in any form or by any
means (including electronic storage
and retrieval or translation into a
foreign language) without prior
agreement and written consent from
Keysight Technologies, Inc. as
governed by United States and
international copyright laws.
Trademark Acknowledgments
Manual Part Number
11612-90005
Edition
Edition 1, August 2021
Supersedes: January 2015
Printed in USA/Malaysia
Published by:
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
Warranty
THE MATERIAL CONTAINED IN THIS
DOCUMENT IS PROVIDED “AS IS,”
AND IS SUBJECT TO BEING
CHANGED, WITHOUT NOTICE, IN
FUTURE EDITIONS. FURTHER, TO
THE MAXIMUM EXTENT PERMITTED
BY APPLICABLE LAW, KEYSIGHT
DISCLAIMS ALL WARRANTIES,
EITHER EXPRESS OR IMPLIED WITH
REGARD TO THIS MANUAL AND
ANY INFORMATION CONTAINED
HEREIN, INCLUDING BUT NOT
LIMITED TO THE IMPLIED
WARRANTIES OF
MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE.
KEYSIGHT SHALL NOT BE LIABLE
FOR ERRORS OR FOR INCIDENTAL
OR CONSEQUENTIAL DAMAGES IN
CONNECTION WITH THE
FURNISHING, USE, OR
PERFORMANCE OF THIS
DOCUMENT OR ANY INFORMATION
CONTAINED HEREIN. SHOULD
KEYSIGHT AND THE USER HAVE A
SEPARATE WRITTEN AGREEMENT
WITH WARRANTY TERMS
COVERING THE MATERIAL IN THIS
DOCUMENT THAT CONFLICT WITH
THESE TERMS, THE WARRANTY
TERMS IN THE SEPARATE
AGREEMENT WILL CONTROL.
Technology Licenses
The hardware and/or software
described in this document are
furnished under a license and may be
used or copied only in accordance
with the terms of such license.
U.S. Government Rights
The Software is “commercial
computer software,” as defined
by Federal Acquisition Regulation
(“FAR”) 2.101. Pursuant to FAR
12.212 and 27.405-3 and
Department of Defense FAR
Supplement (“DFARS”) 227.7202,
the U.S. government acquires
commercial computer software
under the same terms by which
the software is customarily
provided to the public.
Accordingly, Keysight provides
the Software to U.S. government
customers under its standard
commercial license, which is
embodied in its End User License
Agreement (EULA), a copy of
which can be found at
http://www.keysight.com/find/sweula
The license set forth in the EULA
represents the exclusive authority
by which the U.S. government
may use, modify, distribute, or
disclose the Software. The EULA
and the license set forth therein,
does not require or permit,
among other things, that
Keysight: (1) Furnish technical
information related to
commercial computer software
or commercial computer
software documentation that is
not customarily provided to the
public; or (2) Relinquish to, or
otherwise provide, the
government rights in excess of
these rights customarily provided
to the public to use, modify,
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commercial computer software
documentation. No additional
government requirements
beyond those set forth in the
EULA shall apply, except to the
extent that those terms, rights, or
licenses are explicitly required
from all providers of commercial
computer software pursuant to
the FAR and the DFARS and are
set forth specifically in writing
elsewhere in the EULA. Keysight
shall be under no obligation to
update, revise or otherwise
modify the Software. With
respect to any technical data as
defined by FAR 2.101, pursuant
to FAR 12.211 and 27.404.2 and
DFARS 227.7102, the U.S.
government acquires no greater
than Limited Rights as defined in
FAR 27.401 or DFAR 227.7103-5
(c), as applicable in any technical
data.
Safety Notices
A CAUTION notice denotes a hazard. It
calls attention to an operating
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.
A WARNING notice denotes a hazard.
It calls attention to an operating
procedure, practice, or the like that,
if not correctly performed or adhered
to, could result in personal injury or
death. Do not proceed beyond a
WARNING notice until the indicated
conditions are fully understood and
met.

1
Keysight Technologies
11612B Bias Network
Operation and Service Manual
General Information
The 11612B bias network provides a means of supplying dc bias to the center
conductor of a coaxial line of a biasable component or device while blocking
the dc bias to the RF input port.
Instruments Covered by Manual
Each bias network has a five digit serial number. The contents of this manual
apply to bias networks having a serial number with the last five digits 02234
and higher.
Incoming Inspection
If the bias network or its case appear to be damaged, set aside the device and
all packaging materials. Contact Keysight as per “Contacting Keysight” on
page 10.
Keysight will arrange for repair or replacement of incomplete or damaged
shipments without waiting for a settlement from the transportation company.
See also, “Returning a Device to Keysight” on page 9.
Preparation For Use
The 11612B bias network is connected in line with the device to be biased. The
bias is applied through the SMB snap-on connector. Refer to Figure 2 on
page 5. A BNC to SMB adapter cable (part number 5062-4550) is also
included in the 11612B bias network assembly.

2 Operation and Service Manual 11612-90005
General Information
-
Specifications
Specifications describe the device’s warranted performance.
It is critical that you properly set the power levels before connecting the
bias network to the power supply. Failure to do so may result in irreparable
damage to the bias coil. Bias coils damaged by overheating are not
covered under warranty.
Table 1 11612B Specifications
Frequency Range Power DC Resistance from Bias Port
to Output Port (typical)
0.045 to 50 GHz –– At 23 °C 0.31 ohm
Return Loss (both ports) – Minimum –– At 23 °C, full rated current 0.35 ohm
0.045 to 10 GHz 20 dB Operating Environment
10 to 20 GHz 15 dB Temperature 0 + 55 °C
20 to 30 GHz 12 dB Humidity – Up to 95%
30 to 50 GHz 10 dB Altitude: Up to 7,625 meter (25,000 feet)
Insertion Loss – Maximum –– Storage and Shipment
0.045 to 10 GHz 0.8 dB Temperature: –40 + 75 °C
10 to 30 GHz 1.5 dB Humidity: Up to 95%
30 to 45 GHz 2.5 dB Altitude: Up to 7,625 meters (25,000 feet)
45 to 50 GHz 3.2 dB

Operation and Service Manual 11612-90005 3
General Information
Supplemental Characteristics
Supplemental characteristics are non-warranted performance parameters.
They are included to provide useful operating information.
It is critical that you properly set the power levels before connecting the
bias network to the power supply. Failure to do so may result in irreparable
damage to the bias coil. Bias coils damaged by overheating are not
covered under warranty.
Table 2 11612B Supplemental Characteristics
Pin Depth10.000 to 0.0076 mm (0.0000 to 0.0030 inches)
Impedance 50 ohms, nominal
Maximum RF Input Power +24 dBm
Maximum bias voltage ±40 Vdc
Maximum bias current 500 mA
Maximum dc leakage current 100 nA
RF Connectors 2.4 mm female
Bias Connector (non-hermetic) SMB male
Net Weights 0.072 kg (0.158 lb)
Dimensions (nominal, not including connectors) 50.8 mm x 38 mm x 25.4 mm
(2.0 in x 1.5 in x 1.0 in)
1. The electrical performance of the bias network is independent of its pin depth within the range stated above.

4 Operation and Service Manual 11612-90005
General Information
-
Operation
Figure 1 shows a schematic diagram of the bias network. The circuit is a “tee”
in which the capacitor in the left arm acts as a dc block/high pass filter. The
vertical arm, with its series inductance and shunt capacitance, acts as a low
pass filter.
Figure 1 Bias Network Schematic Diagram
Transistors and negative resistance devices may oscillate if the bias port of
the 11612B bias network is not properly terminated.
Keysight recommends that bias from the bias supply be routed through the
11635A bias decoupling network before being applied to the bias port of
the 11612B. An adapter cable (part number 5062-4550) is included to
connect the bias network and the bias decoupling network.

Operation and Service Manual 11612-90005 5
General Information
Figure 2 shows the 11612B bias network connected in a typical measurement
setup. Although other applications are possible, the general method of setup
and operation is the same.
Figure 2 Typical Measurement Setup
Transistors and negative resistance devices may oscillate if the bias port of
the 11612B bias network is not properly terminated. Keysight recommends
that bias from the bias supply be routed through the 11635A bias
decoupling network before being applied to the bias port of the 11612B.
An adapter cable (part number 5062-4550) is included to connect the bias
network and the bias decoupling network.

6 Operation and Service Manual 11612-90005
General Information
-
Performance Tests
The procedures in this section test the electrical performance of the 11612B
using the specifications listed in this document as performance standards.
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 have acceptable results depending
on the quality of the components.
Record the results of the performance tests in the Performance Test Record.
Refer to Table 5 on page 8.
Return Loss of Input and Output Ports
1. Connect the equipment for a standard reflection measurement.
2. Calibrate the system with an open and a short.
3. Connect the appropriate RF port of the 11612B to the network analyzer
test port. Terminate the opposite port with a 50 ohm load.
4. Measure the return loss. Refer to the specifications listed in this
document.
The return loss of the terminating load should be at least 20 dB better than
the desired measurement value.
Table 3 11612B Return Loss
Return Loss (both ports) Minimum
0.045 to 10 GHz 20 dB
10 to 30 GHz 15 dB
30 to 45 GHz 12 dB
45 to 50 GHz 10 dB

Operation and Service Manual 11612-90005 7
General Information
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 11612B.
4. Measure the insertion loss. Refer to the specifications listed in this
document. See also, Table 4, “11612B Insertion Loss.”
Table 4 11612B Insertion Loss
Insertion Loss Maximum
0.045 to 10 GHz 0.8 dB
10 to 30 GHz 1.5 dB
30 to 45 GHz 2.5 dB
45 to 50 GHz 3.2 dB

8 Operation and Service Manual 11612-90005
General Information
-
Storage and Shipment
Store and ship the bias network within the following limits:
Table 5 Performance Test Record
ELECTRICAL SPECIFICATIONS
Serial Number: ______________ Tested by: ______________
Date: ______________
Return Loss Measured Value
Input Port
0.045 to 10 GHz
10 to 20 GHz
20 to 30 GHz
30 to 50 GHz
Output Port
0.045 to 10 GHz
10 to 20 GHz
20 to 30 GHz
40 to 50 GHz
Insertion Loss
0.045 to 10 GHz
10 to 30 GHz
30 to 45 GHz
45 to 50 GHz
Temperature –40 to +75 °C
Humidity up to 95%
Altitude up to 7,625 meters (25,000 feet), mean sea level

Operation and Service Manual 11612-90005 9
General Information
Returning a Device to Keysight
If your device requires service, contact Keysight Technologies for information
on where to send it. See “Contacting Keysight” on page 10. Include the
following information:
—yourcompanynameandaddress
— a technical contact person within your company, and the person's complete
telephone number
— the part number and serial number of each device
— the type of service required
—adetailed description of the problem and how the device was being used
when the problem occurred

10 Operation and Service Manual 11612-90005
General Information
-
Contacting Keysight
Assistance with test and measurement needs and information on finding a
local Keysight office are available on the Web at:
www.keysight.com/find/assist
In any correspondence or telephone conversation, refer to the Keysight
product by its model number and full serial number. With this information,
the Keysight representative can determine whether your product is still
within its warranty period.

Installation Note Xxxxx-xxxxx 3

This information is subject to change
without notice.
© Keysight Technologies 1989-2021
Edition 1, August 2021
www.keysight.com
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