Method and apparatus for a finely adjustable clock circuit

A method for generating a finely adjustable clock signal, the method comprising the steps of:

• a) generating a plurality of oscillations, each of the plurality of oscillations having an approximately equal period and being phase shifted by an approximately equal phase offset;
• b) producing corresponding periodic representations for each of the plurality of oscillations based on a given count value;
• and
• c) selecting one of the corresponding periodic representations as an output oscillation based on a control signal, wherein the control signal represents a difference between a refresh update rate and an image update rate.

A method for generating a finely adjustable clock signal, the method comprising the steps of:

• a) generating a plurality of oscillations, each of the plurality of oscillations has an approximately equal period and is phase shifted by an approximately equal phase offset;
• b) counting cycles of each of the plurality of oscillations to produce counted cycles;
• c) comparing the counted cycles with a given count value;
• and
• d) when the counted cycles match the given count value, generating a corresponding periodic representation for each of the plurality of oscillation, and
• e) selecting one of the corresponding periodic representations as an output oscillation.

A phase locked loop circuit comprising:

• an input divider operably coupled to receive an input frequency and to produce, therefrom, a divided representation;
• a phase detection circuit operably coupled to receive the divided representation and a feedback representation;
• a controlled oscillation circuit operably coupled to receive an output of the phase detection circuit and to produce, therefrom, a plurality of oscillations, of which, one is selected as an output oscillation;
• and
• a feedback divider operably coupled to receive the output oscillation and to produce, therefrom, the feedback representation, the feedback divider includes:
• a plurality of counting circuits, wherein each of the plurality of counting circuits are operably coupled to receive a corresponding one of the plurality of oscillations and to produce, therefrom, a corresponding periodic representation based on a given value;
• and
• a controller operably coupled to the plurality of counting circuits, wherein the controller selects, based on a control signal, one of the corresponding periodic representations as the feedback representation and wherein the controller provides the given value to the plurality of counting circuits.