发明授权
- 专利标题: D/A converter and output amplifying circuit
- 专利标题(中): D / A转换器和输出放大电路
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申请号: US10250325申请日: 2002-10-23
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公开(公告)号: US07221297B2公开(公告)日: 2007-05-22
- 发明人: Kazunobu Ohkuri , Toshihiko Masuda
- 申请人: Kazunobu Ohkuri , Toshihiko Masuda
- 申请人地址: JP Tokyo
- 专利权人: Sony Corporation
- 当前专利权人: Sony Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Wolf, Greenfield & Sacks, P.C.
- 优先权: JP2001-330557 20011029
- 国际申请: PCT/JP02/11014 WO 20021023
- 国际公布: WO03/039007 WO 20030508
- 主分类号: H03M1/10
- IPC分类号: H03M1/10
摘要:
A D/A converter in which distortion caused by PWM is favorably removed even if a sampling frequency is low relative to a signal frequency is provided. The D/A converter includes a pulse-width-modulated-signal outputting circuit for outputting a pulse-width-modulated signal having a pulse width in accordance with a digital value of an input digital signal. A distortion-correcting-component generating circuit (3) for generating from the input digital signal at least a correcting component corresponding to a distortion component generated in the pulse-width-modulated-signal outputting circuit; a subtractor circuit (2) disposed at an upstream of the pulse-width-modulated-signal outputting circuit, for subtracting the correcting component generated by the distortion-correcting-component generating circuit from the input digital signal; and a phase correcting circuit (10) for correcting phase characteristics of the input digital signal so that the distortion component and the correcting component have a phase difference such that these components have opposite phases in the pulse-width-modulated-signal outputting circuit; are provided.
公开/授权文献
- US20040051654A1 D/A converter and output amplifying circuit 公开/授权日:2004-03-18
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