A 77 GHz waveform generator with MFSK modulation for automotive radar applications

In this paper, a 77 GHz waveform generator with Multiple Frequency Shift Keying (MFSK) is presented. This modulation waveform can improve the detection ability of automotive radar systems. A MFSK Modulation Control Logic (MMCL) is proposed, incorporates a conventional Σ-Δ fractional-N Phase Locked Loop to generate the modulation waveform. The MMCL has capability to track the linear frequency sweep while generating the frequency shift keying (FSK) in each time step. Prior to realizing the hardware, a behavioural simulation is considered and the output of 64 steps is generated. The modulated frequency synthesizer is designed using 130-nm CMOS process. The module of 77 GHz waveform generator, which generates 128 modulation steps, is accomplished. The bandwidth and the frequency step of the modulation are 100 MHz and 300 kHz, respectively. The results demonstrate that the proposed scheme has ability to realize the MFSK modulation waveform for automotive radar systems, also a short processing interval of 6 ms can be achieved.

[1]  Jri Lee,et al.  A 75-GHz Phase-Locked Loop in 90-nm CMOS Technology , 2008, IEEE Journal of Solid-State Circuits.

[2]  Jri Lee,et al.  A Fully-Integrated 77-GHz FMCW Radar Transceiver in 65-nm CMOS Technology , 2010, IEEE Journal of Solid-State Circuits.

[3]  Behzad Razavi.  A Modeling Approach for ¿¿ FractionalN Frequency Synthesizers Allowing Straightforward Noise Analysis , 2003 .

[4]  Henning Ritter,et al.  Pedestrian detection procedure integrated into an 24 GHz automotive radar , 2010, 2010 IEEE Radar Conference.

[5]  Hao Li,et al.  A fully integrated 77GHz FMCW radar transmitter using a fractional-N frequency synthesizer , 2009, 2009 European Radar Conference (EuRAD).

[6]  Yi-Jan Emery Chen,et al.  A 77-GHz CMOS Automotive Radar Transceiver With Anti-Interference Function , 2013, IEEE Transactions on Circuits and Systems I: Regular Papers.

[7]  M. Skolnik,et al.  Introduction to Radar Systems , 2021, Advances in Adaptive Radar Detection and Range Estimation.

[8]  H. Rohling,et al.  Radar waveform for automotive radar systems and applications , 2008, 2008 IEEE Radar Conference.

[9]  Toshiya Mitomo,et al.  A 77 GHz 90 nm CMOS transceiver for FMCW radar applications , 2009, 2009 Symposium on VLSI Circuits.

[10]  Hermann Rohling,et al.  Milestones in radar and the success story of automotive radar systems , 2010, 11-th INTERNATIONAL RADAR SYMPOSIUM.

[11]  Mitchell D. Trott,et al.  A modeling approach for ΣΔ fractional-N frequency synthesizers allowing straightforward noise analysis , 2002, IEEE J. Solid State Circuits.

[12]  M. Perrott.  Fast and accurate behavioral simulation of fractional-N frequency synthesizers and other PLL/DLL circuits , 2002, Proceedings 2002 Design Automation Conference (IEEE Cat. No.02CH37324).

[13]  Michael H. Perrott,et al.  Fractional-N frequency synthesizer design at the transfer function level using a direct closed loop realization algorithm , 2003, Proceedings 2003. Design Automation Conference (IEEE Cat. No.03CH37451).

[14]  Fulvio Gini,et al.  Waveform design and diversity for advanced radar systems , 2012 .