A 58-%-Lock-Range Divide-by-9 Injection-Locked Frequency Divider Using Harmonic-Control Technique.

This paper presents a divide-by-9 injection-locked fre-quency divider (ILFD). It can lock onto about 6-GHz input with a lock-ing range of 3.23 GHz (58%). The basic concept of the ILFD is based on employing self-gated multiple inputs into the multiple-stage ring oscillator. A wide lock range is also realized by adapting harmonic-control circuits, which can boost specific harmonics generated by mixing. The ILFD was fabricated using a 55-nm deeply depleted channel (DDC) CMOS process. It occupies an area of 0.0210 mm2, and consumes a power of 14.4 mW.