Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2007-10-30
2007-10-30
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S175000, C327S276000, C327S281000
Reexamination Certificate
active
11040089
ABSTRACT:
A pulse width modulator (100) and method that facilitates high resolution pulse width modulation is provided. The pulse width modulator (100) creates a pulse width modulated signal having a duty cycle that is proportional to a controllable delay in the modulator. The pulse width modulator combines a first digitally controllable delay (102) with a delay adjustment (104) to provide the controllable delay. In one embodiment, a digital counter (202) is used to provide coarse delay, with the delay adjustment device (210) coupled to the digital counter (202) to provide the fine, high resolution, delay control. Together the digital counter (202) and delay adjustment device (210) provide high resolution pulse width modulation. In one particular implementation, the analog delay adjustment device (100) comprises a delay block (500) designed to provide delay adjustment that is selectively controllable by changing a capacitance in the device.
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Freescale Semiconductor Inc.
Ingrassia Fisher & Lorenz
Le Dinh T.
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