US Patent 11184016 Multiple-moduli ring-oscillator-based frequency divider

The present disclosure includes a frequency divider circuit that includes a superharmonically injection-locked ring oscillator, injection circuitry, and various switches. The input can include a collection of signal components at different phases that are all at the same, but changeable, frequency. The divider's division ratio can be changed during the divider's operation by, for example, utilizing one or more switches to change: the number of stages in the ring oscillator, and/or which stage(s) of the ring oscillator are injected into by which input signal components.