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In this paper, a novel model for accurately evaluating the performance behaviour of subharmonic self-oscillating mixers (SOM) is presented. This model permits to investigate on the effects of various design parameters of SOMs namely in terms of conversion gain, IF frequency, noise figure, and intermodulation distortion. Such an accurate model is specifically important in the design of millimeter-wave...
In recent years wireless sensor systems operating in the microwave and mm-wave range became more and more popular. Automotive radar sensors are still the driving force for the development of higher integrated mm-wave sensors and thus pave the way also for applications in completely new areas. Industrial and life-science applications often require special functionality, smaller size, lower-power consumption,...
A D-Band downconverter implemented in a 130-nm SiGe BiCMOS technology is presented. The mixer is based on a double-balanced Gilbert cell topology with emitter-follower based output IF buffers. The chip includes an integrated 3-stage LO buffer and RF/LO LC-baluns for single-ended on-wafer measurements. Measurements show a peak conversion gain (CG) of 11 dB at 170 GHz, and an input-referred 1 dB compression...
This paper presents a 77-GHz orthogonal frequency-division multiplexing (OFDM) multiple-input multiple-output (MIMO) radar system with 4 GHz bandwidth. Due to the limited bandwidth of the analog-to-digital and digital-to-analog converters a stepped-carrier approach is used. OFDM radar measurements with a bandwidth of 200MHz at 20 different carrier frequencies are combined in signal processing to achieve...
In this paper, we present a system that allows to realize frequency-division multiplexing multiple-input multiple-output (MIMO) radars which are based on the frequency-modulated continuous-wave (FMCW) principle. Multiple frequency-shifted FMCW signals, which can be separated in the receiver, are used as transmit (TX) signals. The frequency shifting is implemented using digitally generated sinusoids...
In this paper, we present a hardware-efficient method, which allows to implement multiple-input multiple-output (MIMO) radars with a separation of the transmit (TX) signals in the frequency domain. The proposed architecture uses binary phase-shift keying (BPSK) modulators within the TX paths of a multi-channel frequency-modulated continuous-wave (FMCW) radar. These BPSK modulators are driven by 1-bit...
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