Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2007-04-24
2007-04-24
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S143000
Reexamination Certificate
active
11297011
ABSTRACT:
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.
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Barnie Rexford
Cirrus Logic Inc.
Harris Andrew M.
Lauture Joseph
Mitch Harris Atty at Law, LLC
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