Pulse width modulation circuit

Details Pulse width modulation circuit Pulse width modulation circuit

2007-09-11

2007-09-11

Lee, Benny (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Pulse width modulator

C327S172000, C327S175000, C331S111000, C331S143000, C331S150000

Reexamination Certificate

active

11320658

ABSTRACT:
The present invention provides a pulse width modulation (PWM) circuit comprising an PWM control circuit for setting an output signal to low when a logical level of a oscillation signal at a first input terminal changes from low to high, for resetting the output level to low in response to an effective input signal at a second terminal, a charge and discharge means for charging a first node (node1) when the output stays in low, for discharging the stored charge of node1when the output stays in high, a comparator (C1) for outputting an output signal to the second terminal according to the first node signal and a first reference signal (Vref0), a discharge current controlling means for the stored charge on the first node, wherein the discharge current controlling means comprises a bias circuit2for controlling the discharge current based on constant current.

REFERENCES:
patent: 6853227 (2005-02-01), Laletin
patent: 7106038 (2006-09-01), Xin-LeBlanc
patent: 7106130 (2006-09-01), Gan et al.
patent: 2004/0201407 (2004-10-01), Lee et al.

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