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This paper proposes and analyzes a CMOS divide-by-8 injection locked frequency divider (ILFD) with a divide-by-2 ring oscillator stacked on a capacitive cross-coupled oscillator used as an <italic>LC</italic> divide-by-4 ILFD. The divide-by-8 ILFD in the TSMC <inline-formula> <tex-math notation="LaTeX">$0.18~\mu \text{m}$ </tex-math></inline-formula> 1P6M CMOS process has a locking range from 15.5 GHz to 17.8 GHz at the power consumption of 10 mW. The varactorless divide-by-8 ILFD occupies a small area of <inline-formula> <tex-math notation="LaTeX">$0.8044\times 0.72$ </tex-math></inline-formula> mm<sup>2</sup>. The ILFD can be used in divide-by-4 mode and has a locking range from 4.8 GHz to 10.6 GHz at the power consumption of 10.43 mW. The ring oscillator based frequency divider (FD) is designed with a pair of differential outputs so that the whole divide-by-8 ILFD provides differential output. The ring oscillator FD uses unbalanced component parameters to optimize the circuit performance and it supplies two unbalanced tail currents to the <italic>LC</italic> ILFD, which also provide unbalanced outputs despite the circuit topology is a symmetric one. The unbalanced approach offers design flexibility.

Current Reused 8:1 Injection Locked Frequency Divider Using Unbalanced Ring Oscillator Frequency Divider