Method and apparatus for tuning frequency of LC-oscillators based on phase-tuning technique
AssigneeThe Hong Kong University of Science and Technology
InventorsHoward Cam Luong, Sujiang Rong
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Abstract
A tunable multiphase ring oscillator includes a plurality of stages connected in series in a ring structure, where each stage generating a stage output from a stage input. Each stage of the tunable multiphase ring oscillator includes a plurality of trans-conductance cells, each generating an output from at least one portion of the stage input. Each stage further includes at least one phase shifting module for imparting at least one phase shift to the at least one portion of the stage input, an oscillator unit for generating the stage output from a combination of the plurality of outputs, and means for varying at least one of the plurality outputs so as to adjust a phase of the stage output.
Claims17
A method for tuning a frequency of a multiphase LC-oscillator, wherein the multiphase LC-oscillator includes a plurality of stages connected in series in a ring structure, and wherein each stage generating a stage output from a stage output, the method including:
- imparting a phase shift to at least one portion of the stage input;
- generating a first and second outputs from the phase-shifted portion and the un-shifted portion of the stage input;
- combining the first and second outputs for forming the stage output;
- and
- adjusting a phase of the stage output by varying at least one of the first and second outputs.
The method for tuning a frequency of a multiphase LC-oscillator, wherein the multiphase LC-oscillator includes a plurality of stages connected in series in a ring structure, each stage generating a stage output from a stage input;
- the method including:
- imparting at least one phase shift to at least one portion of the stage input;
- combining the plurality outputs for forming the stage output;
- and
- adjusting a phase of the stage output by varying at least one of the plurality of outputs.
A tunable multiphase ring oscillator including a plurality of stages connected in series in a ring structure, each stage generating a stage output from a stage input, wherein each stage of the tunable multiphase ring oscillator includes:
- a plurality of trans-conductance cells, each generating an output from at least one portion of the stage input;
- at least one phase shifting module for imparting at least one phase shift to the at least one portion of the stage input;
- an oscillator unit for generating the stage output from a combination of the plurality of outputs;
- and
- means for varying at least one of the plurality outputs so as to adjust a phase of the stage output.
Dependencies are inferred from the claim text.