A 1.8-67GHz Divide-by-4 ILFD Using Area-Efficient Transformer-Based Injection-Enhancing Technique

In this paper, a wide-locking-range divide-by-4 injection locked frequency divider (ILFD) using area-efficient transformer-based inj ection-enhancing technique is introduced. This ILFD is composed of a 4-stages differential ring oscillator and area-efficient injection-enhancing transformer. With the proposed technique, injection current is increased in wide-band frequency with low power consumption and small area. The locking range is extended in all frequency bands of 28GHz, 39GHz and 60GHz. The measured operating range is 1.8-67GHz (190
^%
). The core area of this ILFD is 0.059mm2 in a 65nm CMOS process.