A digital control loop circuit is disclosed which is coupleable to an oscillator to form a configurable, digital phase-locked loop to generate an output signal having a configurable or selectable output frequency. A representative embodiment of the digital control loop circuit may include a memory storing a plurality of configuration parameters, at least one configuration parameter specifying the output frequency; and a digital controller coupleable to receive an input signal from a reference frequency generator having a reference frequency, the digital controller adapted to access the memory and retrieve the plurality of configuration parameters, and to generate a plurality of control signals to the oscillator both to generate the output signal having the output frequency in response to the plurality of configuration parameters, and to match a phase of the output signal to an input signal phase.