A 470-μw multi-modulus injection-locked frequency divider with division ratio of 2, 3, 4, 5 and 6 in 0.13-μm CMOS

This paper presents a multi-modulus injection-locked frequency divider (ILFD) based on a ring oscillator using inverter chains for a small area and low power consumption. In the proposed ILFD, division ratio of 2, 3, 4, 5 and 6 can be performed by selecting a specific loop which consists of a transmission gate and several delay cells. A prototype chip implemented in 0.13 mum CMOS process operates at 5 GHz while consuming 470 muW from 1.2 V supply, where 350 muW is dissipated in me core of the ILFD. The proposed ILFD is the first reported multi-modulus ILFD with a digitally controlled division ratio and the size of the ILFD is 44 times 33 mum². This number is one of the smallest area that have been reported for a ILFD.