发明名称 |
PULSE-WIDTH MODULATION CIRCUIT AND SWITCHING AMPLIFIER |
摘要 |
<P>PROBLEM TO BE SOLVED: To stabilize the response of a pulse-width modulation signal when an amplitude of an audio signal becomes excessive at a negative side. <P>SOLUTION: A pulse-width modulation circuit 10 comprises: a clock generation circuit 11; a differential amplifier circuit 12; a first charge-current generation circuit 13; a second charge-current generation circuit 14; switches SW1 to SW4; capacitors C1 and C2; a first discharge constant-current circuit 15; a second discharge constant-current circuit 16; a first pulse generation circuit 17; a second pulse generation circuit 18; a pulse synthesis circuit 19; and a charge start voltage maintaining circuit 20. The charge start voltage maintaining circuit 20 prevents that charge start voltages of the capacitors C1 and C2 are lower than a voltage Va by supplying a power supply voltage to the capacitors C1 and C2 when the voltages of the capacitors C1 and C2 are almost lower than the voltage Va due to discharge operation by a constant current Id. <P>COPYRIGHT: (C)2013,JPO&INPIT |
申请公布号 |
JP2012217118(A) |
申请公布日期 |
2012.11.08 |
申请号 |
JP20110108933 |
申请日期 |
2011.05.16 |
申请人 |
ONKYO CORP |
发明人 |
NAKANISHI YOSHINORI;SAKAI SHINICHI |
分类号 |
H03K7/08;H03F3/217;H03K4/06 |
主分类号 |
H03K7/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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