Infineon BGT24LTR11 User Manual page 3

User's guide to BGT24LTR11
XENSIV™ 24 GHz radar MMIC
Table of contents
1 Introduction
BGT24LTR11 is a Silicon Germanium radar MMIC for signal generation and reception, operating in the 24.0 GHz
to 24.25 GHz industrial, scientific and medical (ISM) band. It is based on a 24 GHz fundamental voltage-
controlled oscillator (VCO). The device was designed with Doppler-radar applications in mind—as it is capable
of keeping the transmit signal inside the ISM band without any external phase-locked loop (PLL) — and may
also be used in other types of radar such as frequency-modulated continuous wave (FMCW) or frequency shift
keying (FSK).
A built-in voltage source delivers a VCO tuning voltage which is proportional to absolute temperature (PTAT).
When connected to the VCO tuning pin, it compensates for the inherent frequency drift of the VCO over
temperature, thus stabilizing the VCO within the ISM band, eliminating the need for a PLL/Microcontroller. An
integrated 1:16 frequency divider also allows for external phase lock loop VCO frequency stabilization.
The receiver section uses a low noise amplifier (LNA) in front of a quadrature homodyne down-conversion
mixer to provide excellent receiver sensitivity. Derived from the internal VCO signal, an RC-polyphase filter
(PPF) generates quadrature LO signals for the quadrature mixer. I/Q IF outputs are available through single-
ended terminals.
The device is manufactured in a 0.18 μm SiGe:C technology, offering a cutoff frequency of 200 GHz. It is
packaged in a 16-pin leadless RoHS compliant TSNP package.
VEE
TX
VEE
TX_ON
VCC_DIV
Figure 1 BGT24LTR11 block diagram
Application note
VCC
MPA
f-Div
DIV VTUNE
IFI IFQ
BGT24LTR11
IFQ
90°
0°
IFI
PTAT
R_TUNE V_PTAT
3
VEE
RFIN
LNA
VEE
VCC_PTAT
Revision 1.50
2023-02-14