Triple-resonance RLC-tank divide-by-2 injection-locked frequency divider

Conventional CMOS injection-locked frequency dividers (ILFDs) were often designed with a single-resonance LC resonator and they have a single-band locking range. Wide-locking range in these ILFDs was obtained at the cost of lower output power. A triple-resonance (TR) resistor (R), inductor (L) and capacitor (C)-tank ILFD is presented to design a wide-locking range CMOS divide-by-2 circuit, which is based on a cross-coupled n-core MOS pair. The TR ILFD has three overlapped locking ranges seen as one-band locking range at high microwave injection power and it has large output power. At the core power consumption of 6.76 mW and at the microwave input power of 0 dBm, the divide-by-2 TR ILFD achieve a maximum locking range of 5.77 GHz (105.2%) from 2.6 to 8.37 GHz.