Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2009-08-07
2010-11-30
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
07843242
ABSTRACT:
A pulse width modulation (PWM) signal generator generates multiple output PWM signals from an input PWM signal, whereby each output PWM signal has a frequency and duty ratio substantially similar to the input PWM signal and each output PWM signal is phase-shifted in relation to the other output PWM signals. The PWM signal generator samples a PWM cycle of the input PWM signal to determine various PWM parameters representative of the duration of the active portion of the sampled PWM cycle and the total duration of the sampled PWM cycle. The PWM signal generator then uses the PWM parameters to generate corresponding PWM cycles for the output PWM signals using a set of two independent counters. This process of sampling a PWM cycle of the input PWM signal and generating the output PWM signals based on the PWM parameters resulting from the sampling process can be repeated for one or more iterations.
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Cox Cassandra
Freescale Semiconductor Inc.
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