Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2008-01-29
2008-01-29
Cox, Cassandra (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C330S251000
Reexamination Certificate
active
11357495
ABSTRACT:
Pulse-width modulation (PWM) circuits and methods integrate a feedback signal and an input signal to generate an integral signal, and generate a PWM signal by switching an output node from a first source voltage to a second source voltage based upon comparing the integral signal with a first reference voltage, and switching the output node from the second source voltage to the first source voltage based upon comparing the integral signal with a second reference voltage. A comparator unit compares the integral signal with the first and second reference (threshold) voltages, and a drive circuit for buffering the comparator unit's output signals generates drive signals. A feedback circuit generates the feedback signal based on (e.g., proportional with) the PWM signal. The switching circuit may include a P-type switch (e.g., PMOS transistor) and a N-type switch (e.g., NMOS transistor). Associated class-D audio amplifiers and modulation methods are provided.
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Lee Jong-Haeng
Yang Chung-Gil
Cox Cassandra
F. Chau & Assoc. LLC
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