Patent attributes
An extended dynamic range consecutive edge modulation (CEM) method and apparatus provides improved dynamic range in a noise-shaped CEM pulse generator. A limiting circuit is provided to adjust the rising and trailing edge pulse portion widths to correct conditions where a minimum high-state or low-state pulse width would be violated by the commanded output value of the noise-shaping modulator. The adjusting circuit delays the rising edge of the next pulse if the minimum low state pulse width would not be met and/or extends the falling edge portion of the next pulse if the minimum high-state pulse width would not be met. The modulation range may be wider than typically possible for linear operation and may be set to ranges exceeding one-hundred percent modulation. The adjusting circuit overrides commanded modulation values during a next pulse if combination with the previous pulse will cause violation of a minimum pulse width.
