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

A novel technique for wideband injection locking in an LC oscillator is proposed. PLL and injection locking elements are combined symbiotically to achieve wide locking range while retaining the simplicity of the latter. This method doesn't require a phase frequency detector or a loop filter to achieve phase lock. 13.4GHz - 17.2GHz locking range and an average jitter tracking bandwidth of up to 400 MHz was measured in a high-Q LC oscillator. This architecture is used to generate quadrature phases form a single clock without any frequency division, and to provide high frequency jitter filtering while retaining the low frequency correlated jitter essential for clock forwarded receivers.