Title:
D級増幅器における三角波生成回路および該三角波生成回路を用いたD級増幅器
Document Type and Number:
Japanese Patent JP3982342
Kind Code:
B2
Abstract:
The integrating circuit of the triangular wave generating circuit includes an operational amplifier and a capacitor. Switch elements are alternatively turned ON and capacitors are alternatively recharged by the currents flowing in constant-current circuits thus obtaining a triangular wave on an output terminal. In this practice, when the voltage on the output terminal reaches ±1 V, comparator circuits (41, 42) and a flip-flop including NAND gates change over the switch elements. The currents flowing in the constant-current circuits are controlled depending on the current flowing in a load circuit. The current flowing in the load circuit is controlled by a PLL circuit including a phase comparator circuit, a loop filter, an LPF, an operational amplifier and an FET. This provides an output triangular wave having the same frequency as a clock pulse (CK).
Inventors:
Nobuaki Tsuji
Masao Noro
Masao Noro
Application Number:
JP2002181772A
Publication Date:
September 26, 2007
Filing Date:
June 21, 2002
Export Citation:
Assignee:
Yamaha Corporation
International Classes:
H03F3/217; H03K4/06
Domestic Patent References:
| JP62186607A | ||||
| JP63224410A | ||||
| JP59088947U |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Takashi Watanabe