Title:
スイッチング信号変調回路
Document Type and Number:
Japanese Patent JP4494763
Kind Code:
B2
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.
Inventors:
Mitsuo Nakata
Application Number:
JP2003390421A
Publication Date:
June 30, 2010
Filing Date:
November 20, 2003
Export Citation:
Assignee:
Cosel Co., Ltd.
International Classes:
H02M3/28; G05F1/40; H03K4/06; H03K7/08
Domestic Patent References:
| JP7245942A | ||||
| JP7264849A | ||||
| JP2003324944A |
Attorney, Agent or Firm:
Susumu Takeuchi