Phase locked loop apparatus with adjustable phase shift
AssigneeInternational Business Machines Corporation
InventorsChristian Ivo Menolfi, Thomas Helmut Toifl
Life of this patent
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Abstract
The phase locked loop (PLL) with adjustable phase shift is described. The PLL includes a voltage controlled oscillator which is capable of generating multiple phase shifted output signals, and multiple phase detectors capable of determining the phase differences between the output signals and a reference clock. The PLL further includes a weighting device capable of weighting the phase differences and generating a control signal for the voltage controlled oscillator.
Claims10
A phase locked loop with adjustable phase shift, comprising:
- a voltage controlled oscillator configured to generate multiple phase shifted output signals;
- multiple phase detectors configured to determine phase differences between the phase shifted output signals and a reference clock;
- and
- a weighting device configured to weight the phase differences and generate a control signal for the voltage controlled oscillator.
A clock and data recovery system, comprising:
- a phase locked loop including:
- a voltage controlled oscillator configured to generate multiple phase shifted output signals;
- multiple phase detectors configured to determine the phase differences between the phase shifted output signals and a reference clock;
- a weighting device configured to weight the phase differences and generate a control signal for the voltage controlled oscillator;
- and
- wherein multiple sampling latches capable of intermediately storing received data are connected to the voltage controlled oscillator.
A receiver of a serial data link, comprising:
- a phase locked loop including:
- a voltage controlled oscillator configured to generate multiple phase shifted output signals;
- multiple phase detectors configured to determine the phase differences between the phase shifted output signals and a reference clock;
- and
- a weighting device configured to weight the phase differences and generate a control signal for the voltage controlled oscillator.
Dependencies are inferred from the claim text.