Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2011-01-04
2011-01-04
Cox, Cassandra (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S172000
Reexamination Certificate
active
07863956
ABSTRACT:
Instead of reducing the pulse widths of all pulses simultaneously in order to reduce the output power of a switched-mode amplifier linearized by a pulse-width modulator, the width of every other (or every n-th) pulse is reduced. When the widths of the selected pulses have been reduced to zero, the amplifier's output power can be further reduced by selecting further pulses from the remaining non-zero-width pulses, and reducing the widths of those pulses. For example, after every other pulse of an original output signal has been removed, every other pulse of the remaining pulses can be reduced to obtain still lower amplifier output power. In this way, the number of pulses (and thus the number of switching transitions) is reduced for small signals, and therefore the amplifier's switching losses are reduced and efficiency is improved.
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Cox Cassandra
Potomac Patent Group PLLC
Telefonaktiebolaget L M Ericsson (publ)
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