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Wideband phase modulator

  • US 8,723,613 B2
  • Filed: 08/23/2011
  • Issued: 05/13/2014
  • Est. Priority Date: 03/11/2009
  • Status: Active Grant
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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