Keysight 11612A Service manual

Keysight
11612A
Bias Network
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.

Notices
©Keysight Technologies 1989 - 2015
No part of this manual may be reproduced
in any form or by any means (including
electronic storage and retrieval or transla-
tion into a foreign language) without prior
agreement and written consent from Key-
sight Technologies as governed by United
States and international copyright laws.
Manual Part Number
11612-90001
Edition
January 2015
Supersedes: September 2012, October 2013
Keysight Technologies
1400 Fountaingrove Parkway
Santa Rosa, CA 95403
Warranty
The material contained in this docu-
ment is provided “as is,” and is sub-
ject to being changed, without notice,
in future editions. Further, to the max-
imum extent permitted by applicable
law, Keysight disclaims all warran-
ties, either express or implied, with
regard to this manual and any infor-
mation contained herein, including but
not limited to the implied warran-ties
of merchantability and fitness for a
particular purpose. Keysight shall not
be liable for errors or for inciden-tal or
consequential damages in con-
nection with the furnishing, use, or
performance of this document or of
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 shall 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.
Restricted Rights Legend
If software is for use in the performance of
a U.S. Government prime contract or sub-
contract, Software is delivered and
licensed as “Commercial computer soft-
ware” as defined in DFAR 252.227-7014
(June 1995), or as a “commercial item” as
defined in FAR 2.101(a) or as “Restricted
computer software” as defined in FAR
52.227-19 (June 1987) or any equivalent
agency regulation or contract clause. Use,
duplication or disclosure of Software is
subject to Keysight Technologies’ standard
commercial license terms, and non-DOD
Departments and Agencies of the U.S. Gov-
ernment will receive no greater than
Restricted Rights as defined in FAR
52.227-19(c)(1-2) (June 1987). U.S. Govern-
ment users will receive no greater than
Limited Rights as defined in FAR 52.227-14
(June 1987) or DFAR 252.227-7015 (b)(2)
(November 1995), as applicable in any
technical data.
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-
formed or adhered to, could result
in personal injury or death. Do not
proceed beyond a WARNING
notice until the indicated condi-
tions are fully understood and met.

11612A Operating and Service Manual 1
11612A Bias Network
NOTE In the following graphic, all dimensions are in millimeters.
Figure 1 11612A Dimensions

2 11612A Operating and Service Manual
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 SMC adapter 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

11612A Operating and Service Manual 3
11612A Specifications
11612A Option 001 Specifications
CAUTION 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.
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 6 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 6 on page 11.
Pulse Width – Maximum Refer to the duty cycle curves in Figure 5 on
page 10 and Figure 6 on page 11.

4 11612A Operating and Service Manual
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 Deptha
a. The electrical performance of the bias network is independent of its pin depth within the range
stated above.
0.000 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
b. 3.5 mm connectors mate with SMA connectors.
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)
Pin Deptha
a. The electrical performance of the bias network is independent of its pin depth within the range
stated above.
0.000 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
b. 3.5 mm connectors mate with SMA connectors.
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)

11612A Operating and Service Manual 5
CAUTION 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
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.
Figure 2 Bias Network Schematic Diagram

6 11612A Operating and Service Manual
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.
Figure 3 Typical Measurement Setup
NOTE 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.
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.
CAUTION 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.
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.
1. Connect the equipment as shown in Figure 4 on page 7; do not connect the bias network yet.

11612A Operating and Service Manual 7
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 6 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:
• your company name and address
• 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
Temperature –40 to +75 °C
Humidity up to 95%
Altitude up to 7,625 meters (25,000 feet), mean sea level

8 11612A Operating and Service Manual
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.
NOTE The return loss of the terminating load should be at least 20 dB better than the desired
measurement value.
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.

11612A Operating and Service Manual 9
Performance Test Record
ELECTRICAL SPECIFICATIONS
Serial Number: ______________
Tested by : ______________
Date: ______________
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

10 11612A Operating and Service Manual
Figure 5 11612A Option 001 Duty Cycle Curves, Overall View

11612A Operating and Service Manual 11
Figure 6 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
NOTE 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 11612A Operating and Service Manual

This information is subject to change without notice.
©Keysight Technologies 1989 - 2015
January 2015
*11612-90001*
11612-90001
www.keysight.com