A Comparative Study Of Injection Locked Frequency Divider Using Harmonic Mixer In Weak And Strong Inversion

摘要

This paper presents a comparative study of a divide-by-4 injection locked frequency divider with the injection transistor operating in both the weak and strong inversion regions. The relation between the maximum lock range of the frequency divider and the nonlinearity of the injection transistor is investigated. We show that the strong nonlinear characteristics of the injection transistor induce the wider lock range. We further investigate the existence of the optimum biasing point in the weak inversion region, which leads to the maximum lock range given the same injection power. The injection locked frequency divider designed in GF 130 nm 1.2 V CMOS technology, is validated using the simulation results.