Switching signal modulation circuit

Details Switching signal modulation circuit Switching signal modulation circuit

2007-04-24

2007-04-24

Nguyen, Matthew V. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S271000, C363S021010

Reexamination Certificate

active

10989465

ABSTRACT:
A switching signal modulation circuit includes a switching control circuit having an ON time control terminal and an OFF time control terminal, the switching control circuit capable of adjusting respectively separately ON time and OFF time of a switching signal using values of resistors externally attached respectively to the ON time control terminal and the OFF time control terminal; a spread signal generating circuit operable to output a spread signal; an ON time setting resistor connected between the ground and the ON time control terminal of the switching control circuit; an OFF time setting resistor connected between the ground and the OFF time control terminal of the switching control circuit; a first weight resistor operable to vary the frequency and the duty of the switching signal, the first weight resistor connected between an output of the spread signal generating circuit and the ON time control terminal of the switching control circuit; and a second weight resistor operable to vary the frequency and the duty of the switching signal, the second weight resistor connected between the output of the spread signal generating circuit and the OFF time control terminal of the switching control circuit.

REFERENCES:
patent: 4420804 (1983-12-01), Nishino
patent: 5640315 (1997-06-01), Hirano et al.
patent: 6051960 (2000-04-01), Ito et al.
patent: 6580253 (2003-06-01), Kanakubo et al.
patent: 6914419 (2005-07-01), Katayama
patent: 2004/0263140 (2004-12-01), Adragna et al.

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