Abstract
This letter presents a 140-GHz frequency-modulated continuous-wave (FMCW) radar sensor for automotive applications. The monolithic microwave integrated circuit (MMIC) inside of the sensor features one transmit (TX) and one receive (RX) channel as well as the possibility to apply binary phase shift keying (BPSK) modulation to the transmitted signal. The chip is bonded on a printed circuit board (PCB) that features substrate integrated waveguides (SIWs) to minimize losses in the signal distribution. It provides rectangular waveguide (RWG) outputs for the <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$D$ </tex-math></inline-formula> -band to facilitate the connection of measurement equipment and antennas. The complete sensor system is controlled by a backend board that is connected via pin headers on top of the RF board with the bonded chip.
Highlights
I N RECENT years, a trend can be observed to switch to CMOS technologies in automotive long-range radar (LRR) implementations [1]–[3], which were dominated over more than a decade by SiGe bipolar technologies
As BiCMOS processes are attractive for cost-efficient implementations at higher frequencies, or systems with high output power requirements, due to their superior device performance
The logic board that is placed on top of the RF board is similar to the one used in [17] and [18]
Summary
I N RECENT years, a trend can be observed to switch to CMOS technologies in automotive long-range radar (LRR) implementations [1]–[3], which were dominated over more than a decade by SiGe bipolar technologies. A bistatic radar system operating in the potential new automotive radar frequency band of 134–141 GHz [4], [5] is introduced Such a system could be used together with the existing sensor implementations to enable autonomous. A digital interface can be used to control the different blocks and to vary their dc operation point by programmable current sources, which are not shown here for readability. This allows to control the output power of the transmitter via a 6-bit register. The power splitter that is used features three differential outputs and allows to expand the chip by an additional channel in a future implementation.
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