A 28-nm CMOS 40-GHz high-resolution digitally controlled oscillator for automotive radar applications

We present the first millimeter-wave digitally controlled oscillator (DCO) in a 28-nm CMOS technology. This DCO is developed as an integral part of all-digital phase-locked loop for automotive radar applications. The DCO achieves a tuning range of 3.6 GHz (39.3–42.9 GHz) with a fine frequency resolution less than 1 MHz and phase noise of −99.5 dBc/Hz at 1-MHz offset at 39.3 GHz. The DCO occupies 0.08 mm2 and consumes 10.5 mW. Impacts on DCO design from closely filled dummies to meet extremely stringent local density rules in the 28-nm CMOS process, which has not been investigated before, are also discussed.

[1]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.

[2]  Luca Fanori,et al.  A dither-less all digital PLL for cellular transmitters , 2011, 2011 IEEE Custom Integrated Circuits Conference (CICC).

[3]  Jason Wei,et al.  A 25 GHz Fast-Lock Digital LC PLL With Multiphase Output Using a Magnetically-Coupled Loop of Oscillators , 2015, IEEE Journal of Solid-State Circuits.

[4]  K. Muhammad,et al.  All-digital PLL and transmitter for mobile phones , 2005, IEEE Journal of Solid-State Circuits.

[5]  Robert B. Staszewski,et al.  Spur-Free Multirate All-Digital PLL for Mobile Phones in 65 nm CMOS , 2011, IEEE Journal of Solid-State Circuits.

[6]  Robert B. Staszewski,et al.  A 56.4-to-63.4 GHz Multi-Rate All-Digital Fractional-N PLL for FMCW Radar Applications in 65 nm CMOS , 2014, IEEE Journal of Solid-State Circuits.

[7]  Xun Luo,et al.  A waveform-shaping millimeter-wave oscillator with 184.7dBc/Hz FOM in 40nm digital CMOS process , 2015, 2015 IEEE MTT-S International Microwave Symposium.

[8]  Frank Wang,et al.  CMOS digital controlled oscillator with embedded DiCAD resonator for 58–64GHz linear frequency tuning and low phase noise , 2009, 2009 IEEE MTT-S International Microwave Symposium Digest.

[9]  Robert B. Staszewski,et al.  High-Resolution Millimeter-Wave Digitally Controlled Oscillators With Reconfigurable Passive Resonators , 2013, IEEE Journal of Solid-State Circuits.