Current controlled pulse width modulation circuit and...

Details Current controlled pulse width modulation circuit and... Current controlled pulse width modulation circuit and...

2006-02-14

2006-02-14

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

06998894

ABSTRACT:
A pulse width modulation (PWM) circuit comprising an input circuit, first and second controllers, and first and second Schmidt triggers. The first controller sets a first voltage level by a first current generated responding to an input signal and an output of the input circuit. The first Schmidt trigger sets a first logic level when an output of the first controller reaches the first voltage level. The second controller sets a second voltage level by a second current generated responding to the input signal and an output of the first Schmidt trigger. The second Schmidt trigger generates a PWM output signal with a variable frequency in accordance with the first and second currents.

REFERENCES:
patent: 3875929 (1975-04-01), Grant
patent: 5498989 (1996-03-01), Diba
patent: 5907254 (1999-05-01), Chang
patent: 6707320 (2004-03-01), Trivedi et al.
patent: 6819154 (2004-11-01), Greenfeld

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