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The radar-front end (RFE) is an integrated transceiver circuit for the 120 GHz ISM band with antennas on chip in a QFN 5x5 package. It includes a low-noise amplifier (LNA), quadrature mixers, poly-phase filter, voltage controlled oscillator with digital band switching, divide-by-32 outputs, and transmit and receive antennas. The RF-signal from oscillator is directed to RX path via buffer circuits. The RX signal is amplified by a LNA and converted to baseband in two mixers with quadrature LO. The 120 GHz oscillator has three analog coarse tuning inputs and one analog fine tuning input. The tuning inputs can be combined to obtain large tuning range and large bandwidth. The analog tuning inputs together with integrated frequency divider and external fractional-N PLL can be used for frequency modulated continuous wave (FMCW) radar operation. With fixed oscillator frequency it can be used in continuous wave (CW) mode. Other modulation schemes are possible as well by utilizing analog tuning inputs. The IC is fabricated in IHP SG13S SiGe BiCMOS technology of IHP [1].


Main application field of the 120 GHz transceiver RFE is in short range radar systems. With the use of dielectric lenses, the range can be increased considerably. The RFE can be used in FMCW mode as well in CW-mode. Although the chip is intended for use in ISM band 122 GHz - 123 GHz, it is also possible to extend bandwidth to the full tuning range of almost 7 GHz.


What is the Field of View?

The beam of the TRA_120_002 has an angle of nearly 180°.