Controllable oscillator with output oscillation adjustment and method for producing an output oscillation for use therewith

A phase locked loop comprising:

• a difference detection module operably coupled to determine a difference signal based on at least one of a phase difference and a frequency difference between a reference oscillation and a feedback oscillation;
• a loop filter module operably coupled to convert the difference signal into a control signal;
• an oscillator having a plurality of taps for producing a plurality of outputs, the oscillator operably coupled to convert the control signal into an output oscillation;
• an output oscillation adjust module operably coupled to the oscillator for producing an effective output oscillation based on an oscillation control signal, wherein the output oscillation adjust module includes:
• an output select block, operably coupled to the plurality of taps, for producing the effective output oscillation from a sequence of selected taps from the plurality of taps based on a sequence of tap adjust control signals;
• and
• a tap adjust control generator, responsive to the oscillation control signal that includes an integrator having an integrator output, responsive to the oscillation control signal and a modulo(x) module that produces the sequence of tap adjust control signals based on the integrator output;
• and
• a divider module operably coupled to convert the effective output oscillation into the feedback oscillation.

A method for producing an output oscillation, the method comprising the steps of:

• generating a difference signal based on at least one of phase a difference and a frequency difference between a reference oscillation and a feedback oscillation;
• filtering the difference signal to produce a control signal;
• converting the control signal into an output oscillation using a controlled oscillation module;
• adjusting the output oscillation to produce an effective output oscillation based on an oscillation control signal;
• and
• dividing the effective output oscillation by a selected divisor to produce the feedback oscillation;
• wherein the effective output oscillation has a frequency Feo and the output oscillation has a frequency Fo and wherein |Feo=Fo|/Fo<0.5.