A wideband injection locking scheme and quadrature phase generation in 65nm CMOS

Abstract

Abstract-A novel technique for wideband injection locking in an LC oscillator is proposed. Phased-lock-loop and injection-locking elements are combined symbiotically to achieve wide locking range while retaining the simplicity of the latter. This method does not require a phase frequency detector or a loop filter to achieve phase lock. A mathematical analysis of the system is presented and the expression for new locking range is derived. A locking range of 13.4-17.2 GHz and an average jitter tracking bandwidth of up to 400 MHz were measured in a high-LC oscillator. This architecture is used to generate quadrature phases from a single clock without any frequency division. It also provides high-frequency jitter filtering while retaining the low-frequency correlated jitter essential for forwarded clock receivers.