Coded data generation or conversion – Digital code to digital code converters – To or from particular bit symbol
Reexamination Certificate
2011-06-14
2011-06-14
Nguyen, Khai M (Department: 2819)
Coded data generation or conversion
Digital code to digital code converters
To or from particular bit symbol
C341S143000, C341S152000, C330S010000
Reexamination Certificate
active
07961120
ABSTRACT:
A noise shaper truncates the widths of pulses it supplies to a pulse-width modulator whose pulse-width modulated signals control a tri-level amplifier. The amplifier is filterless and DC free. Pulses that are narrower than a predefined minimum width are eliminated by the noise shaper. Other pulses are subjected to an algorithm that includes a multitude of ranges, each range defined by a minimum pulse width characterizing a lower bound of that range and a maximum pulse width characterizing an upper bound of that range. Associated with each range is a number of clock cycles defining the modified width of a pulses whose detected width falls within that range. To ensure that delays associated with a feedback loop disposed in the amplifier are accounted for, the reference voltage of a comparator tracks an output voltage of an integrator. Both the comparator and integrator are disposed in the loop.
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Neilsen, Karsten, “PEDEC—A Novel Pulse Referenced Control Method for High Quality Digital PWM Switching Power Amplification”, IEEE, 1998.
Marvell International Ltd.
Nguyen Khai M
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