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Patent Searching and Data


Title:
三角波生成回路
Document Type and Number:
Japanese Patent JP4453463
Kind Code:
B2
Abstract:
A triangular wave generating circuit adapted to a class-D amplifier is designed not to use a PLL circuit and to secure robustness regarding an amplification gain irrespective of variations of voltages, thus producing a high-quality triangular wave with a simple circuit constitution. First and second constant currents, which are generated in proportion to positive and negative voltages, are alternately and periodically selected using high impedance elements without causing noise. A first integrator produces a triangular wave in response to charged electricity realized by the first and second constant currents, wherein the triangular wave is supplied to a second integrator performing servo-amplification operation so as to suppress phase shifts thereof. Hence, it is possible to maintain a constant gain for the class-D amplifier irrespective of variations of voltages since the maximal and minimal voltages values of the triangular wave are made proportional to the positive and negative voltages.

Inventors:
Nobuaki Tsuji
Application Number:
JP2004197384A
Publication Date:
April 21, 2010
Filing Date:
July 02, 2004
Export Citation:
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Assignee:
Yamaha Corporation
International Classes:
H03K4/06; H03F3/217
Domestic Patent References:
JP5763930A
JP62104308A
JP63224410A
JP2004007324A
JP7231226A
JP2004128750A
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe