Keysight N4985A User Manual

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Keysight N4985A System Amplifiers

Operating and Service Manual

Notices

CAUTION

WARNING

duced 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 as governed by United States and international copyright laws.

Manual Part Number

N4985-90001

Edition

Edition 4, May 7, 2019

Printed in:

Printed in Malaysia

Published by:

Keysight Technologies Bayan Lepas Free Industrial Zone, 11900 Penang, Malaysia

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.

Declaration of Conformity

Declarations of Conformity for this product and for other Keysight products may be downloaded from the Web. Go to http://www.keysight.com/

go/conformity. You can then search by

product number to find the latest Declaration of Conformity.

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, reproduce, release, perform, display, or disclose commercial computer software or 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.

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 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.

Safety Information

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.

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Compliance Notices and Regulatory Information

Compliance with Electromagnetic Compatibility (EMC)

This product conforms with the protection requirements of EMC Directive 2004/ 108/EC for Electromagnetic Compatibility.

This product complies to the EMC Directive by assessment according to the IEC/ EN61326-1:2005 EMC standard.

In order to preserve the EMC performance of this product, any cable which becomes worn or damaged must be replaced with the same type and specifications.

This is a sensitive measurement apparatus by design and may have some performance loss (sidebands up to -60dBc, and loss of gain up to 18dB) when exposed to ambient continuous electromagnetic phenomenon in the range of 80MHz-6GHz when tested per IEC 61000-4-3.

Keysight N4985A Operating and Service Manual 3

Regulatory markings

The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives.

The RCM mark is a registered trademark of the Australian Communications and Media Authority.

South Korean Class A EMC declaration:

This equipment is Class A suitable for professional use and is for use in electromagnetic environments outside of the home.

The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives.

ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001. Cet appareil ISM est conforme a la norme NMB-001 du Canada.

ISM GRP.1 Class A indicates that this is an Industrial Scientific and Medical Group 1 Class A product.

This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use. Forty years is the expected useful life of the product.

This instrument complies with the WEEE Directive (2002/96/ EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

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Waste Electrical and Electronic Equipment (WEEE) Directive 2002/ 96/EC

This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

Product category

With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.

The affixed product label is as shown below.

Do not dispose in domestic household waste.

To return this unwanted instrument, contact your nearest Keysight Service Center, or visit http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information.

Sales and Technical Support

To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites:

– www.keysight.com/find/mta

(product-specific information and support, software and documentation updates)

– www.keysight.com/find/assist

(worldwide contact information for repair and service)

Keysight N4985A Operating and Service Manual 5

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6 Keysight N4985A Operating and Service Manual

Compliance Notices and Regulatory Information . . . . . . . . . . . . . . . . . . 3

Compliance with Electromagnetic Compatibility (EMC) . . . . . . . . . . .3

Regulatory markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/

EC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Product category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Sales and Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1Introduction

Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Features of the Keysight N4985A amplifiers . . . . . . . . . . . . . . . . . . .16

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

2Installation

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Service and Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Operating and Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

ESD damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Connector care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3 Specifications

General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Supplementary Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Mechanical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

4Operating Guide

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Performance verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Keysight N4985A Operating and Service Manual 7

Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

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List of Figures

Figure 1-1 Keysight N4985A-S30/N4985A-S50 amplifier . . . . . .14

Figure 1-2 Keysight N4985A-P15/N4985A-P25 amplifier . . . . . .15

Figure 3-1 Small signal parameters versus frequency (for

Figure 3-2 Gain versus output power (P

Figure 3-3 Saturated output power (for N4985A-S30) . . . . . . . . .28

Figure 3-4 N4985A-OA3 (2 Figure 3-5 N4985A-OA3 (2

Figure 3-6 N4985A-OA3 (2 Figure 3-7 N4985A-OA3 (2

Figure 3-8 Small signal parameters versus frequency (for

Figure 3-9 Gain versus output power (P

Figure 3-10 Saturated output power (for N4985A-S50) . . . . . . . . .32

Figure 3-11 Input pulse = Ch3, 420 m Vppk, 10.4 pS rise time, Output

Figure 3-12 N4985A-OA5 (2 Figure 3-13 N4985A-OA5 (2

Figure 3-14 N4985A-OA5 (2 Figure 3-15 N4985A-OA5 (2

Figure 3-16 Typical N4985A-P15 performance (S21) . . . . . . . . . . .37

Figure 3-17 Typical N4985A-P15 performance (group delay) . . . .37

Figure 3-18 Typical N4985A-P15 performance (S11, S22) . . . . . .38

Figure 3-19 Typical N4985A-P15 performance (saturated output

Figure 3-20 Typical N4985A-P25 performance (S21) . . . . . . . . . . .39

Figure 3-21 Typical N4985A-P25 performance (group delay) . . . .39

N4985A-S30) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

indicated with *) [for

1dB

N4985A-S30] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

– 1) EYE: >7 V output (1.5 V/div) . .29

– 1) EYE: <500 fs added rms jitter (5 ps/

div) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

– 1) EYE: <10 ps Tf/Tf (5 ps/div) . . 30

– 1) EYE: Input signal from PRBS

generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

N4985A-S50) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

indicated with *) [for

1dB

N4985A-S50] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

pulse = Ch4, 6.5 Vppk, 11.0 pS rise time (for

N4985A-S50) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

– 1) EYE: >7 V output (1.5 V/div) . .33

– 1) EYE: <500 fs added rms jitter (5 ps/

div) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

– 1) EYE: <10 ps Tf/Tf (5 ps/div) . . 34

– 1) EYE: Input signal from PRBS

generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Keysight N4985A Operating and Service Manual 9

Figure 3-22 Typical N4985A-P25 performance (S11, S22) . . . . . . 40

Figure 3-23 Typical N4985A-P25 performance (saturated output

power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 3-24 Mechanical dimensions of the N4985A-S30/N4985A-S50

amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 3-25 Mechanical dimensions of the N4985A-P15/N4985A-P25

amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 4-1 Verification setup with a power splitter . . . . . . . . . . . 46

Figure 4-2 Verification setup with a calibrated coupler . . . . . . . . 46

Figure 4-3 Example of an amplified RF power measurement system

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List of Tables

Table 3-1 N4985A-S30 and N4985A-S50 specifications . . . . . .26

Table 3-2 Additional specifications for N4985A-OA3 . . . . . . . . .27

Table 3-3 Additional specifications for N4985A-OA5 . . . . . . . . .27

Table 3-4 N4985A-P15 and N4985A-P25 specifications . . . . . .35

Table 3-5 Supplementary specifications for the N4985A amplifiers

Table 3-6 Physical specifications for the N4985A amplifiers . . .41

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Keysight N4985A System Amplifiers Operating and Service Manual

1 Introduction

Product Overview 14

This chapter provides an overview of the N4985A system amplifiers.

1Introduction

N4985A-S30 amplifier

N4985A-S50 amplifier

Product Overview

High performance broadband RF amplifier

The N4985A-S30 and N4985A-S50 system amplifiers are high performance, broadband amplifiers featuring baseband RF (<100 kHz) through millimeter wave frequency coverage. These amplifiers, which have many uses in research, development, or production-line environment, are a useful addition to the laboratory where RF, microwave, or millimeter wave measurements are made. Typical applications include:

– RF source amplifier.

– Mixer LO amplifier.

– Noise figure LNA and noise figure system amplifier.

– Pulse amplifier and time domain applications.

– Digital communication systems.

– Antenna research and development.

– General purpose RF gain block.

Figure 1-1 Keysight N4985A-S30/N4985A-S50 amplifier

14 Keysight N4985A Operating and Service Manual

Introduction 1

N4985A-P15 amplifier

N4985A-P25 amplifier

High performance system amplifier

The N4985A-P15 and N4985A-P25 are high performance, broadband amplifiers with excellent power and gain up to 50 GHz, which have many uses in research, development, or production-line environment. These amplifiers are a useful addition to the laboratory where RF, microwave, or millimeter wave measurements are made. Typical applications include:

– Driver for high power amplifiers such as TWT or linear power amplifiers.

– Overcome system losses such as long transmission lines, power dividers, etc.

– Antenna research and development; antenna characterization systems.

– Broadband RF characterization.

Figure 1-2 Keysight N4985A-P15/N4985A-P25 amplifier

Keysight N4985A Operating and Service Manual 15

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