Infineon BGT24MTR11 User Manual

RF and Protection Devices

BGT24MTR11

Application Note AN305

Revision: Rev. 1.0
2012-11-15

User's Guide to BGT24MTR11

24 GHz Radar

Edition 2012-11-15
Published by

Infineon Technologies AG
81726 Munich, Germany

© 2012 Infineon Technologies AG
All Rights Reserved.

Legal Disclaimer

The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any
information regarding the application of the device, Infineon Technologies hereby disclaims any and all
warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual
property rights of any third party.

Information
For further information on technology, delivery terms and conditions and prices, please contact the nearest

Infineon Technologies Office (www.infineon.com).
Warnings

Due to technical requirements, components may contain dangerous substances. For information on the types in
question, please contact the nearest Infineon Technologies Office.

Infineon Technologies components may be used in life-support devices or systems only with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the
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persons may be endangered.

BGT24MTR11

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Application Note AN305
Revision History: 2012-11-15

Previous Revision: prev. Rev. x.x

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Subjects (major changes since last revision)

User's Guide

Trademarks of Infineon Technologies AG

A-GOLD™, BlueMoon™, COMNEON™, CONVERGATE™, COSIC™, C166™, CROSSAVE™, CanPAK™,

CIPOS™, CoolMOS™, CoolSET™, CONVERPATH™, CORECONTROL™, DAVE™, DUALFALC™,

DUSLIC™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPACK™, EconoPIM™, E-GOLD™,

EiceDRIVER™, EUPEC™, ELIC™, EPIC™, FALC™, FCOS™, FLEXISLIC™, GEMINAX™, GOLDMOS™,

HITFET™, HybridPACK™, INCA™, ISAC™, ISOFACE™, IsoPACK™, IWORX™, M-GOLD™, MIPAQ™,
ModSTACK™, MUSLIC™, my-d™, NovalithIC™, OCTALFALC™, OCTAT™, OmniTune™, OmniVia™,
OptiMOS™, OPTIVERSE™, ORIGA™, PROFET™, PRO-SIL™, PrimePACK™, QUADFALC™, RASIC™,
ReverSave™, SatRIC™, SCEPTRE™, SCOUT™, S-GOLD™, SensoNor™, SEROCCO™, SICOFI™,

SIEGET™, SINDRION™, SLIC™, SMARTi™, SmartLEWIS™, SMINT™, SOCRATES™, TEMPFET™,
thinQ!™, TrueNTRY™, TriCore™, TRENCHSTOP™, VINAX™, VINETIC™, VIONTIC™, WildPass™,

X-GOLD™, XMM™, X-PMU™, XPOSYS™, XWAY™.

Other Trademarks

AMBA™, ARM™, MULTI-ICE™, PRIMECELL™, REALVIEW™, THUMB™ of ARM Limited, UK. AUTOSAR™
is licensed by AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT

Forum. COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.).
EPCOS™ of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium.

HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™

of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR
STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc.
MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. Mifare™ of NXP. MIPI™ of MIPI Alliance, Inc.
MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO. OmniVision™ of
OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF

Micro Devices, Inc. SIRIUS™ of Sirius Sattelite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™
of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co.
TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA.

UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™
of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™

of Diodes Zetex Limited.

Last Trademarks Update 2009-10-19

Application Note AN305, Rev. 1.0 2012-11-15

BGT24MTR11

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User's Guide

List of Content, Figures and Tables

Table of Content

1 Introduction ........................................................................................................................................ 5

2 Overview ............................................................................................................................................. 5

3 VCO Section ........................................................................................................................................ 6

3.1 Tuning Voltage Inputs .......................................................................................................................... 6

3.2 Prescalers ............................................................................................................................................ 8

3.2.1 Divide-by-16 Prescaler ......................................................................................................................... 8

3.2.2 Divide-by-65536 Prescaler ................................................................................................................... 8

4 Transmitter Section ........................................................................................................................... 9

4.1 TX Section ............................................................................................................................................ 9

4.1.1 Enabling and Disabling of the Output Power ..................................................................................... 10

4.1.1.1 Enabling/disabling via the SPI bus. .................................................................................................... 10

4.1.1.2 Enabling/disabling via the TXOFF pin. ............................................................................................... 10

4.2 LO Section .......................................................................................................................................... 11

5 Receiver Section .............................................................................................................................. 11

5.1 Low Noise Amplifier............................................................................................................................ 11

5.2 Mixer ................................................................................................................................................... 11

6 Sensors ............................................................................................................................................. 12

6.1 Power Sensors ................................................................................................................................... 12

6.2 Temperature Sensor .......................................................................................................................... 13

Authors 14

List of Figures

Figure 1 BGT24MTR11 block diagram ............................................................................................................... 5

Figure 2 VCO frequency vs. tuning voltage V
Figure 3 3D plot: Output frequency vs. V
Figure 4 2D plot: Output voltage vs. V

COARSE

COARSE

= V

FINE

and V

and V

and temperature ................................................... 6

COARSE

................................................................................. 7

FINE

...................................................................................... 7

FINE

Figure 5 Termination of Div16 outputs ............................................................................................................... 8

Figure 6 TX output power vs. frequency for different temperatures ................................................................. 10

Figure 7 Transfer characteristics of power sensors ......................................................................................... 12

Figure 8 Transfer characteristics of temperature sensor ................................................................................. 13

List of Tables

Table 1 Output power reduction ........................................................................................................................ 9

Table 2 Truth table for analog multiplexer ....................................................................................................... 12

Application Note AN305, Rev. 1.0 2012-11-15

BGT24MTR11

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BGT24MTR11_Chip_BID.vsd

SPI

Buffer

/16

TX

PA

/65536

3

TX

Power

Sensor

Temp.

Sensor

PPF*

LNA

IFI

IFQ

90°

0°

RFIN

LO

Buffer

MPA

IFQX

IFIX

* Poly Phase Filter

FINE

COARSE

Q1 Q1N Q2

SI CS CLK

LO

POWER

SENSOR

AMUX

2

2

TEMP

ANA

VCCTEMP

TXOFF

TXX

LO

User's Guide

Introduction

1 Introduction

This document provides supplementary information on how to use BGT24MTR11 that you may not completely
find in the datasheet.

BGT24MTR11 is the lead product of Infineon’s BGT24-series of 24 GHz radar transceiver products and serves
here as an example for all BGT24 products in this application note. All building blocks of BGT24MTR11
described here can be found on the other two products, BGT24MTR12 and BGT24MR2 as well. The additional
information in this application note is valid for these products as well.

2 Overview

The picture below shows the internal block diagram of BGT24MTR11.

Figure 1 BGT24MTR11 block diagram

The following sub-sections of the block diagram will be covered in this application note:

 Voltage controlled oscillator (VCO) and prescalers
 Transmitter chain including both TX and LO outputs
 Reciver chain including LNA and mixer
 On-chip sensors

Application Note AN305, Rev. 1.0 2012-11-15