Wide Locking of Divide-by-4 Injection-locked Frequency Divider for Radar Communications

We developed a divide-by-4 injection-locked frequency divider (ILFD) for processing 0.18 µm 1P 6M CMOS of TSMC which is used for for radar communications. The voltage-controlled oscillator (VCO) was used to couple with ILFD and MOSFET. The DC gate bias of cross-coupled FETs was optimized for DDC drain bias. For a drain-source bias of 1.1 V, the locking range of the ILFD was 3.53 GHz (36.04 %) in the frequency of 8.03-11.56 GHz at 0 dBm incident power. The power expense was 10.6 mW.