Agilent 11612A Operations Guide

Notice

Hewlett-Packard to Agilent Technologies Transition

This documentation supports a product that previously shipped under the Hewlett­Packard company brand name. The brand name has now been changed to Agilent
Technologies. The two products are functionally identical, only our name has changed. The
document still includes references to Hewlett-Packard products, some of which have been
transitioned to Agilent Technologies.

Printed in USA March 2000

Contacting Agilent

By internet, phone, or fax, get assistance with all your test and measurement needs.

Table 1-1 Contacting Agilent

Online assistance: www.agilent.com/find/assist
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(tel) 1 800 452 4844

New Zealand

(tel) 0 800 738 378
(fax) ([phone]

Latin America

(tel) [phone]
(fax) [phone]

Japan

(tel) ([phone]
(fax) ([phone]

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(tel) 1 877 894 4414
(fax) [phone]

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1-800-16510170 (PLDT
Subscriber Only)

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[phone] (within Bangkok)
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Taiwan 0800-047-866 (886) 2 25456723
People’s Republic

of China

800-810-0189 (preferred)

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(fax) ([phone]

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Operating and Service Manual

Agilent Technologies

11612A Bias Network

Includes Option 001

SERIAL NUMBERS

This manual applies directly to Agilent 11612A Bias Networks with
serial number prefix 2301A and higher.

Manual Part Number 11612-90001

Printed in USA

December 1989

Microfiche Part Number 11612-90002

© Copyright 1989 Agilent Technologies

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at the time
of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements
are traceable to the United States National Institute of Standards and Technology

(NET,

formerly NBS), to the extent allowed by the Institute’s calibration facility, and to the calibration
facilities of other International Standards Organization members.

WARRANTY

This Hewlett-Packard instrument product is warranted against defects in material and workmanship
for a period of one year from date of delivery. During the warranty period, Hewlett-Packard
Company will, at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by HP.
Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to
Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP
from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its
programming instructions when properly installed on that instrument. HP does not warrant that the
operation of the instrument, or software, or firmware will be uninterrupted or error free.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance
by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper site preparation or mainte­nance.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL

NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

Product maintenance agreements and other customer assistance agreements are available for Hewlett-
Packard products.

For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are
provided at the back of this manual.

8P21.2

I I

I I

SIDE VIEW

NOTE:

All dimensions are in millimeters.

Figure 1.

0

HP

11612A

Dimensions

HP

116lZA

The HP
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 HP 11612A bias network.

11612A

bias network provides a means of supplying dc bias to the center conductor of a coaxial

Option 001

In addition to the capabilities of the standard bias network, the HP 11612A option 001 high current bias
network can achieve higher bias levels above 0.4
as transistor testing.

GHz.

These bias levels are useful in applications such

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 equal to or higher than the serial number listed on the title page of this manual.

The microfiche part number is listed on the title page of this manual. Use this number to order 4x6 inch
microfilm transparencies of the manual.

If the bias network or its case appear to be damaged, set aside the device and all packaging materials
and contact the nearest Hewlett-Packard office listed inside the back cover of this manual.

Hewlett-Packard will arrange for repair or replacement of incomplete or damaged shipments without
waiting for a settlement from the transportation company.

PREPARATION FOR USE

The HP
through the SMB snap-on connector. Refer to Figure 3. A BNC to SMC adapter cable is also included in
the HP 11612A bias network assembly (HP part number 5062-4550).

Operate the bias network within the following limits:

11612A

Temperature

Humidity

Altitude Up to 7,625 meters (25,000 feet), mean sea level

bias network is connected in line with the device to be biased. The bias is applied

0 to

+55”c

up to 95%

HP

116l2A

1 l

Specifications describe the device’s warranted performance. Table 1 lists the specifications of the
HP 11612A bias network; Table 2 lists the specifications of the HP

11612A

Option 001 high current bias

network.

Table 1.

Operating Temperature

Frequency Range

Return Loss (both ports) - minimum

0.045

to 8

GHz
8toI8GHt

I8 to 26.5

Operating Temperature
Frequency Range’

Return Loss (both ports) - minimum

0.4 to I

I to I8
I8 to 26.5

Insertion Loss - Maximum

0.4

12.4 to 26.5

GHz

GHz

GHz

GHz

to 12.4

GHz

GHz

0.045

to 26.5 GHz

Table 2.

0.4

to 26.5

0 to

HP

0 to

20

18dB
14dB

11612A

14dB
18dB

I4

1.0
I.5

HP

11612A

Specifications

55°C

dB

55°C

GHz

dB

dB
dB

Insertion Loss - Maximum

0.045

12.4 to 26.5 GHz

Maximum Bias Current

Maximum Bias Voltage

Option 001 Specifications

Maximum Bias Current

Maximum Bias Voltage
Duty Cycle

Pulse Width - Maximum

to 12.4 GHz

-

Maximum

0.8

dB

1.3

dB

500

mA

t

40

Vdc

2 amps DC; up to

mode, refer to Figures 5 and 6.

32 amps in pulsed

kI00Vdc

Refer to Figures 5

and 6, the duty

cycle curves

Refer to Figures 5

and 6, the duty

cycle curves

1

Operation below 0.4

GHz

is possible but not specified.

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 irrepaira-
ble damage to the bias coil. Bias coils damaged by overheating are not
covered under warranty.

2

HP ll6l2A

SUPPLEMENTAL CHARACTERISTICS

Supplemental characteristics are non-warranted performance parameters. They are included to provide
useful operating information. Table 3 lists the supplemental characteristics of the HP
Table 4 lists the supplemental characteristics of the HP

11612A

Option 001 high current bias network.

11612A

bias network.

Table 3.

Pin

Depth’

Impedance

DC Resistance from Bias Port to

Output Port (typical)

At 23°C
At

23°C

full rated current

1

The electrical performance of the bias network is independent of its pin depth within the range stated above.

2

3.5 mm connectors mate with SMA connectors.

Table 4.

Pin

Depth’

Impedance
DC Resistance from Bias Port to

Output Port (typical)

At 23°C
At

23”C,

full rated current

HP 11612A

Supplemental Characteristics

0.000 to 0.127 mm

(0.0000 to 0.0050 in)

50 ohms, nominal

.5

ohms

.7

ohms

HP

11612A

Option

0.000 to 0.127 mm

(0.0000 to 0.0050 in)

50 ohms, nominal

.1 ohms

.12

ohms

RF Connectors

RF Input
RF Output

Bias Connector

(non=hermetic)

Net Weight

Dimensions (nominal
not including connectors)

001

Supplemental Characteristics

30mmx33mmx25mm

(1.2 in x 1.3 in x 1 .O in)

RF Connectors

RF Input
RF Output

Bias Connector (non-hermetic)
Net Weight

Dimensions (nominal

not including connectors)

30mmx33mmx25mm

(1.2 in x 1.3 in x 1 .O in)

3.5

mm*

female

3.5 mm male

SMB male

0.075 kg (0.165 lb)

3.5

mm*

female

3.5 mm male
SMB male

0.075 kg (0.165 lb)

HP ll6l2A

1

The electrical performance of the bias network is independent of its pin depth within the range stated-above.

2

3.5 mm connectors mate with SMA connectors.

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.

r-------1

RF

INPUT

I
I

1
1

800pF

I
I

RF

1

BIAS

&

I

z+’

F

I

2jlH’

I

I I

I

1. Option 001 is approximately

2. Option

Figure 2.

Figure 3 shows the HP 11612A bias network connected in a typical measurement setup. Although other
applications are possible, the general method of setup and operation is the same.

DC

POUER SUPPLY

000

HP1 1612R

001 is approximately

Bias Network Schematic Diagram

lo

PORT 1

RF

(INPlJT)

I

BIAS

100

nH.

100 pF.

.

POUER SUPPLY

000

HP11612R

4

NOTE 1:

RF AND BIAS

(OUTPUT)

Figure 3.

I

Typical Measurement Setup

RF AND BIAS
(OUTPUT)

I

Transistors and negative resistance devices may oscillate if the bias port of the HP 11612A
bias network is not properly terminated. Hewlett-Packard recommends that bias from the
bias supply be routed through the HP 11635A bias decoupling network before being applied
to the bias port of the HP 11612A. An adapter cable (HP part number 5062-4550) is included
to connect the bias network and the bias decoupling network.

HP

116l2A

NOTE FOR PULSED OPERATION USERS (OPTION 001)

Follow the procedure below to set the correct power levels for the bias network when you’re using it for
pulsed measurements. This procedure applies only to the HP 11612A option 001 high current bias
network and should not be used with the standard HP 11612A.

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 irrepaira-
ble 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; do not connect the bias network yet.

CW RN0

OSCILLOSCOPE

DC POUER SUPPLY

PULSED

PORT 1

NOTE= CONNECT THE

BIAS

NETWORK TO

0.1 ohm, 200W
RESISTOR

GND

Figure 4.

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).

4.

When the bias current and repetition rate are within the allowed limits, remove the resistor and

HP

11612A

THE DC SUPPLY AFTER
THE CURRENT AND

REPETlTlON

BEEN SET WITH THE
HIGH POWER RESISTOR
AS DESCRIBED IN THIS
PROCEDURE.

RATE HAVE

Option 001 Bias Level Setup

I

PORT 2

insert the bias network.

HP

116lzA

Store and ship the bias network within the following limits:

Temperature

Humidity

Altitude Up to 7,625 meters (25,000 feet), mean sea level

-40 to

up to 95%

+75”c

Tagging for Service

If you need to return the bias network to Hewlett-Packard for service, complete one of the blue repair

tags located at the end of this manual and attach it to the device. If no repair tag is available, attach a tag

indicating the type of service required, your return address, model number, and serial number of the

device to be repaired.

Containers and materials like those used in factory packaging are available through HP offices.
The following general instructions should be used for re-packing with commercially available materials:
a.

Wrap the device in heavy paper or plastic (include a service tag as described above).

b.

Use a strong shipping container.

c.

Use a layer of shock absorbing material 70 to 100 mm (3 to 4 inches) thick around each side of the

device to provide firm cushioning and prevent movement inside the container.

Regardless of which type of packaging you use, always:

d.

Seal the shipping container securely.

e.

Mark the shipping container FRAGILE to ensure careful handling.

f.

In any correspondence refer to the device by model number and serial number.

HP ll6lZA

The procedures in this section test the eletrical performance of the HP

of Tables 1 and 2 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 give acceptable results depending on the quality of

the components.

Record the results of the performance tests in Table 5, the Performance Test Record, at the end of the
procedures.

11612A

using the specifications

Return Loss of Input and Output Ports

The following instructions apply to both vector and scalar network analyzers.

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 HP 11612A to the test port. Terminate the opposite port with
a 50 ohm load.

NOTE:

4. Measure the return loss. Refer to Tables 1 and 2 for specifications.

The return loss of the terminating load should be at least 20 dB better than the desired
measurement value.

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 HP 11612A.

4.

Measure the insertion loss. Refer to Tables 1 and 2 for specifications.

*

HPll6l!ZA

Table 5.

HP

11612A

Performance Test Record

Serial Number

Standard HP 11612A

Return Loss

Input Port

0.045

to 8

GHz

8to18GHz

18 to 26.5

output Port

0.045

8to18GHz

18

to 26.5

Insertion Loss

0.045

12.4 to 26.5

GHz

to 8

GHz

GHz

to 12.4

GHz

GHz

Test Date

HP 11612A Option 001

Return Loss

Input Port

0.4

to 1

GHz

1

to18GHz

18 to 26.5 GHz

output Port

0.4

to 1

GHz

1

to18GHz

18 to 26.5 GHz

Insertion Loss

0.4

to 12.4

12.4 to 26.5

GHz

GHz

Tested By

I

HP

8

ll612A

32.00

30.00 .

-

28.00 .

26.00

24.00 ’

22.00

20.00

18.00

16.00

14.00

12.00

10.00

8.00

0.37%

3.7

l

magimum

msec

maximum pulse width

duty cycle

’

0.75%

7.5

magimum

msec

maximum pulse width

duty cycle

3% maximum duty cycle
30

msec maximum

pulse width

6.00

4.00

2.00

0.00

HP ll6l2A

30.00

35.00

Figure

40.00

HP

5.

11612A

45.00

PEAK POWER,

d8m

Option 001 Duty Cycle

OveraN

View

50.00

Curues

55.00

60.00

2

m

x
4

e

6.00

5.50

5.00

4.50

4.00

3.50

3.00

2.50

2.00

1.50

1.00

0.50

0.00

30.00

32.00

Figure 6.

34.00

HP

36.00

PEAK POWER,

11612A

Option 001 Duty Cycle

Exploded View

38.00

dBm

40.00

Curoes

Lc2.00

,

44.00

10

HPll6l2A