Keysight Technologies 11612A Service manual

Operating and
Service Manual
Includes Option 001
Serial Numbers: This manual applies directly
to Keysight 11612A Bias Networks with serial
number prefix 2301A and higher.
Keysight
11612A
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
11612-90001
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 TOTHIS MANUAL AND
ANY INFORMATION CONTAINED
HEREIN, INCLUDING BUT NOT
LIMITED TOTHE IMPLIED
WARRANTIES OF
MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE.
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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
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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
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Accordingly, Keysight provides
the Software to U.S. government
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which can be found at
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government acquires no greater
than Limited Rights as defined in
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(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
11612A Bias Network
Operation and Service Manual
11612A Bias Network
Figure 1 11612A Dimensions
In the following graphic, all dimensions are in millimeters.

2 Operation and Service Manual 11612-90001
11612A Bias Network
-
General Information
The 11612A bias network provides a means of supplying dc bias to the center
conductor of a coaxial line of a component or device while blocking the dc
bias to the RF input port.
This manual contains information required to install, operate, and test the
11612A bias network.
Option 001
In addition to the capabilities of the standard bias network, the 11612A option
001 high current bias network can achieve higher bias levels above 0.4 GHz.
These bias levels are useful in applications such as transistor testing.
Bias Networks 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 equal to or higher than the serial
number listed on the title page of this manual.
Incoming Inspection
If the bias network or its case appear to be damaged, set aside the device and
all packaging materials and contact Keysight. Refer to “Contacting Keysight”
on page 11.
Preparation For Use
Interconnections
The 11612A 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 3 on
page 6. A BNC to SMBadapter cable (part number 5062-4550) is also
included in the 11612A bias network assembly.
Operating Environment
Operate the bias network within the following limits:
Specifications
Specifications describe the device’s warranted performance.
Temperature 0 to +55 °C
Humidity up to 95%
Altitude up to 7,625 meters (25,000 feet), mean sea level

Operation and Service Manual 11612-90001 3
11612A Bias Network
11612A Specifications
11612A Option 001 Specifications
Frequency Range 0.045 to 26.5 GHz
Return Loss (both ports) – Minimum --
0.045 to 8 GHz 20 dB
8 to 18 GHz 18 dB
18 to 26.5 GHz 14 dB
Insertion Loss – Maximum --
0.045 to 12.4 GHz 0.8 dB
12.4 to 26.5 GHz 1.3 dB
Maximum Bias Current 500 mA
Maximum Bias Voltage ±40 Vdc
Frequency Rangea
a. Operation below 0.4 GHz is possible but not specified.
0.4 to 26.5 GHz
Return Loss (both ports) – Minimum --
0.045 to 1 GHz 14 dB
1 to 18 GHz 18 dB
18 to 26.5 GHz 14 dB
Insertion Loss – Maximum --
0.4 to 12.4 GHz 1.0 dB
12.4 to 26.5 GHz 1.5 dB
Maximum Bias Current 2 amps dc; up to 32 amps in pulsed mode. Refer
to Figure 5 on page 10 and Figure 5-1 on
page 11.
Maximum Bias Voltage ±100 Vdc
Duty Cycle – Maximum Refer to the duty cycle curves in Figure 5 on
page 10 and Figure 5-1 on page11.
Pulse Width – Maximum Refer to the duty cycle curves in Figure 5 on
page 10and Figure 5-1 on page11.
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.

4 Operation and Service Manual 11612-90001
11612A Bias Network
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Supplemental Characteristics
Supplemental characteristics are non-warranted performance parameters.
They are included to provide useful operating information.
11612A Supplemental Characteristics
11612A Option 001 Supplemental Characteristics
Pin Deptha0.000 to 0.127 mm (0.0000 to 0.0050 inches)
Maximum RF Input Power +24 dBm
Impedance 50 ohms, nominal
dc Resistance from Bias Port to Output Port (typical) --
At 23 °C0.5 ohms
At 23 °C, full rated current 0.7 ohms
RF Connectors --
RF Input 3.5 mmbfemale
RF Output 3.5 mm male
Bias Connector (non-hermetic) SMB male
Net Weight 0.075 kg (0.165 lb)
Dimensions (nominal, not including connectors) 30 mm x 33 mm x 25 mm (1.2 in x 1.3 in x 1.0 in)
a. The electrical performance of the bias network is independent of its pin depth within the range stated above.
b. 3.5 mm connectors mate with SMA connectors.
Pin Deptha0.000 to 0.127 mm (0.0000 to 0.0050 inches)
Maximum RF Input Power +24 dBm
Impedance 50 ohms, nominal
dc Resistance from Bias Port to Output Port (typical) --
At 23 °C0.1 ohms
At 23 °C, full rated current 0.12 ohms
RF Connectors --
RF Input 3.5 mmbfemale
RF Output 3.5 mm male
Bias Connector (non-hermetic) SMB male
Net Weight 0.075 kg (0.165 lb)
Dimensions (nominal, not including connectors) 30 mm x 33 mm x 25 mm (1.2 in x 1.3 in x 1.0 in)
a. The electrical performance of the bias network is independent of its pin depth within the range stated above.
b. 3.5 mm connectors mate with SMA connectors.

Operation and Service Manual 11612-90001 5
11612A Bias Network
Operation
Figure 2
Figure 2 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.
Bias Network Schematic Diagram
Figure 3 shows the 11612A bias network connected in a typical measurement
setup. Although other applications are possible, the general method of setup
and operation is the same.
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.

6 Operation and Service Manual 11612-90001
11612A Bias Network
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Figure 3 Typical Measurement Setup
Instructions for Pulsed Operation (Option 001)
The following procedure sets the correct power levels for the bias network
when you’re using it for pulsed measurements. This procedure applies only to
the 11612A option 001 high current bias network and should not be used with
the standard 11612A.
Setting the Bias Current and Repetition Rate
the following procedure uses a 0.1 ohm wire wound high power resistor to
simulate the bias network so the correct bias level and repetition rate can be
set before the bias network is connected.
Transistors and negative resistance devices may oscillate if the bias port of
the 11612A 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 11612A.
An adapter cable (part number 5062-4550) is included to connect the bias
network and the bias decoupling network.
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.

Operation and Service Manual 11612-90001 7
11612A Bias Network
1. Connect the equipment as shown in Figure 4 on page 7; do not connect
the bias network yet.
Figure 4 11612A Option 001 Bias Level Setup
2. Measure the voltage across the resistor with an oscilloscope.
3. Set the current and repetition rate to the appropriate values (taken from
the curve in Figure 5-1 on page 11.)
4. When the bias current and repetition rate are within the allowed limits,
remove the resistor and insert the bias network.
Storage and Shipment
Store and ship the bias network within the following limits:
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 11. Include the
following information:
—yourcompanynameandaddress
— a technical contact person within your company, and the person's complete
telephone number
Temperature –40 to +75 °C
Humidity up to 95%
Altitude up to 7,625 meters (25,000 feet), mean sea level

8 Operation and Service Manual 11612-90001
11612A Bias Network
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— 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
Performance Tests
The procedures in this section test the electrical performance of the 11612A
using the specifications listed in this document as performance standards.
Record the results of the performance tests in the Performance Test Record,
located at the end of the procedures.
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 11612A 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.
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 11612A.
4. Measure the insertion 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 4-1 Performance Test Record
ELECTRICAL SPECIFICATIONS
Serial Number: ______________
Tested by: ______________
Date: ______________

Operation and Service Manual 11612-90001 9
11612A Bias Network
Standard 11612A 11612A Option 001 Measured Value
Return Loss
Input Port Input Port
0.045 to 8 GHz 0.4 to 1 GHz
8 to 18 GHz 1 to 18 GHz
18 to 26.5 GHz 18 to 26.5 GHz
Output Port Output Port
0.045 to 8 GHz 0.4 to 1 GHz
8 to 18 GHz 1 to 18 GHz
18 to 26.5 GHz 18 to 26.5 GHz
Insertion Loss
0.045 to 12.4 GHz 0.4 to 12.4 GHz
12.4 to 26.5 GHz 12.4 to 26.5 GHz
Table 4-1 Performance Test Record

10 Operation and Service Manual 11612-90001
11612A Bias Network
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Figure 5 11612A Option 001 Duty Cycle Curves, Overall View

Operation and Service Manual 11612-90001 11
11612A Bias Network
Figure 5-1 11612A Option 001 Duty Cycle Curves, Overall View
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.

12 Operation and Service Manual 11612-90001
11612A Bias Network
-

Installation Note Xxxxx-xxxxx 3

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