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Modulator for digital amplifier

  • US 20030031245A1
  • Filed: 07/25/2002
  • Published: 02/13/2003
  • Est. Priority Date: 07/26/2001
  • Status: Active Grant
First Claim
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1. A restricted modulation method comprising the steps of:

  • receiving an input signal that alternates between first and second states;

    storing the input signal and providing the stored input signal as an output signal;

    monitoring the received input signal to measure a) an amount of time for each state in the input signal to provide a pulse width value and b) an amount of time between successive changes from one of the first and second states to the other one of the first and second states to provide a pulse period value;

    substituting the output signal for the input signal if the pulse width value is less than a first predetermined value or if the pulse period value is less than a second predetermined value;

    substituting an inverted output signal for the input signal if the pulse width value is greater than a third predetermined value.

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