A 90GHz 65nm CMOS Injection-Locked Frequency Divider
Pierre Mayr, Christopher Weyers, Ulrich Langmann
2007 IEEE International Solid-State Circuits Conference, Feb. 2007, San Francisco, Dig. Tech. Papers, pp. 198-199
Distance-control systems in automobiles increase the security and the driving comfort of the occupants. The frequency bands around 24 and 79GHz are intended for short range radar-based purposes while long-range radar solutions are allocated around 77GHz. Figure 10.6.1 shows the block diagram of a phase-locked loop (PLL) for such systems containing two cascaded divide-by-2 circuits (leading to a divide-by-4 configuration). In this paper, an injection-locked divider (ILD) is presented which is able to divide an input signal from 82 to 94.1GHz by two. Moreover, a divideby-4 ILD is also reported with a locking range from 79.7 to 81.6GHz.