Method and apparatus for pulse width modulation

Details Method and apparatus for pulse width modulation Method and apparatus for pulse width modulation

2006-10-04

2009-12-08

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S170000

Reexamination Certificate

active

07629823

ABSTRACT:
An apparatus and method of providing a pulse width modulated signal that is responsive to a current are disclosed. A circuit according to aspects of the present invention includes a capacitor to convert a first current to a first voltage on the capacitor during a first time duration and to discharge a second current from the capacitor to change the first voltage to a second voltage during a second time duration. A comparator is also included and is coupled to an output of the capacitor to compare a voltage on the capacitor to a reference voltage during the second time duration to change a pulse width of a periodic output signal in response to an input current.

REFERENCES:
patent: 7268639 (2007-09-01), Matsushita
patent: 7378889 (2008-05-01), Wu

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