Wideband phase modulator
First Claim
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1. An apparatus for phase modulation, comprising:
- a delay locked loop configured to generate a plurality of phase shifted signals from a reference signal, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal, wherein the reference signal is periodic, and wherein the delay locked loop comprises a delay line configured to receive the reference signal, the delay line having a delay substantially equal to the period of the reference signal; and
a selection circuit configured to output one of the phase shifted signals based on phase information, wherein the selection circuit comprises a logic circuit configured to generate a phase change direction command and a phase change magnitude command based on the phase information, wherein the selection circuit is configured to output the one of the phase shifted signals based on the phase change direction and phase change magnitude commands.
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Abstract
An apparatus for phase modulation includes a delay locked loop configured to generate from a reference signal a plurality of phase shifted signals, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal, and a multiplexer configured to select one of the phase shifted signals.
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Citations
18 Claims
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1. An apparatus for phase modulation, comprising:
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a delay locked loop configured to generate a plurality of phase shifted signals from a reference signal, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal, wherein the reference signal is periodic, and wherein the delay locked loop comprises a delay line configured to receive the reference signal, the delay line having a delay substantially equal to the period of the reference signal; and a selection circuit configured to output one of the phase shifted signals based on phase information, wherein the selection circuit comprises a logic circuit configured to generate a phase change direction command and a phase change magnitude command based on the phase information, wherein the selection circuit is configured to output the one of the phase shifted signals based on the phase change direction and phase change magnitude commands. - View Dependent Claims (2, 3, 4, 5)
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6. A method for phase modulation, comprising:
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generating a plurality of phase shifted signals from a reference signal, wherein the phase shifted signals are locked to the reference signal, and further wherein the phase shifted signals have distinct phases with respect to the reference signal, wherein generating the plurality of select signals is based on received phase information, wherein the reference signal is periodic, and wherein the phase shifted signals are generated with a delay line configured to receive the reference signal, the delay line having a delay substantially equal to the period of the reference signal; generating a phase change direction command based on received phase information; generating a phase change magnitude command based on the received phase information; and outputting a selected one of the phase shifted signals based on the phase change direction command and the phase change magnitude command.
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7. An apparatus for phase modulation, comprising:
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a delay locked loop configured to generate a plurality of phase shifted signals from a reference signal, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal; and a multiplexer configured to select one of the phase shifted signals based on a phase change direction command and a phase change magnitude command. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for phase modulation, comprising:
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generating a plurality of phase shifted signals from a reference signal, wherein the phase shifted signals are locked to the reference signal, and further wherein the phase shifted signals have distinct phases with respect to the reference signal; and selecting one of the plurality of phase shifted signals based on a phase change direction command and a phase change magnitude command. - View Dependent Claims (14)
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15. An apparatus for phase modulation, comprising:
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means for generating a plurality of phase shifted signals from a reference signal, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal, wherein the reference signal is periodic, and wherein the means for generating the plurality of phase shifted signals comprises means for sequentially delaying the reference signal to generate the plurality of phase shifted signals, the means for sequentially delaying having an aggregate delay equal to substantially a period of the reference signal; and means for outputting one of the phase shifted signals based on received phase information, wherein the means for outputting the one of the phase shifted signals is configured to generate a phase change direction command and a phase change magnitude command based on the received phase information, and wherein the means for outputting the one of the phase shifted signals is configured to output the one of the phase shifted signals based on the phase change direction and phase change magnitude commands.
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16. A non-transitory computer readable medium encoded with codes executable by at least one processor to:
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generate a plurality of phase shifted signals from a reference signal, wherein the phase shifted signals are locked to the reference signal, and further wherein the phase shifted signals have distinct phases with respect to the reference signal, wherein the reference signal is periodic, and wherein the phase shifted signals are generated with a delay line configured to receive the reference signal, the delay line having a delay substantially equal to the period of the reference signal; generate a phase change direction command based on received phase information; generate a phase change magnitude command based on the received phase information; and outputting one of the phase shifted signals based on the phase change direction command and the phase change magnitude command.
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17. An apparatus for phase modulation, comprising:
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means for generating a plurality of phase shifted signals from a reference signal, each of the phase shifted signals being locked to the reference signal and having a different phase shift from the other phase shifted signals with respect to the reference signal; and means for selecting one of the phase shifted signals based on a phase change direction command and a phase change magnitude command.
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18. A non-transitory computer readable medium encoded with codes executable by at least one processor to:
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generate a plurality of phase shifted signals from a reference signal, wherein the phase shifted signals are locked to the reference signal, and further wherein the phase shifted signals have distinct phases with respect to the reference signal; and select one of the plurality of phase shifted signals based on a phase change direction command and a phase change magnitude command.
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Specification