Infineon BGT24LTR11 User Manual page 2

User's guide to BGT24LTR11
XENSIV™ 24 GHz radar MMIC
Table of contents
Table of contents
About this document ....................................................................................................................... 1
Table of contents ............................................................................................................................ 2
1 Introduction .......................................................................................................................... 3
2 Building blocks ...................................................................................................................... 4
2.1 Transmitter .............................................................................................................................................. 4
2.2 Receiver ................................................................................................................................................... 5
2.3 Voltage controller oscillator (VCO) ......................................................................................................... 7
2.4 Proportional to absolute temperature (PTAT) voltage source .............................................................. 8
2.5 Frequency divider .................................................................................................................................... 9
3 Evaluation board ................................................................................................................... 10
3.1 Schematic diagram ............................................................................................................................... 10
3.2 Matching structures .............................................................................................................................. 11
3.3 Layout .................................................................................................................................................... 12
3.4 Layout version improving TX to RX isolation ....................................................................................... 12
4 VCO control .......................................................................................................................... 14
4.1 VCO control using PTAT ........................................................................................................................ 14
4.2 VCO control using a PLL ........................................................................................................................ 16
4.3 VCO control using a software based open-loop concept .................................................................... 17
4.3.1 Hardware setup ................................................................................................................................ 17
4.3.2 Concept ............................................................................................................................................ 18
4.3.3 Operation ......................................................................................................................................... 20
References .................................................................................................................................... 21
Revision history............................................................................................................................. 22
Disclaimer..................................................................................................................................... 23
Application note 2 Revision 1.50
2023-02-14