A Multi-Mode Multi-Coil Coupled Tuned Inductive Peaking ILFD for Low Injected Power With Compact Size

In this paper, a multi-mode magnetically coupled and tuned inductive peaking technique with impedance transforming capability is proposed to achieve a wider operational locking range in the injection locked frequency divider (ILFD) for low injected power levels. Fabricated in 65 nm CMOS process, the proposed ILFD operating at 60 GHz, achieves a locking range of 16.3% from 53.2 to 63 GHz with a low injected power of -10 dBm. Occupying a small area of 0.0288 mm2, the ILFD delivers an average single-ended output power of -6 dBm with a dc power consumption of 3.7 mW from a 1.2 V supply voltage. The power efficiency (P
_out
/P
_dc
) of the proposed ILFD is 6.8%.