发明公开
EP0312672A1 Offset correction circuit for a sigma-delta coding device
失效
Offset-Korrekturschaltungfüreine Sigma-Delta-Kodierungsvorrichtung。
- 专利标题: Offset correction circuit for a sigma-delta coding device
- 专利标题(中): Offset-Korrekturschaltungfüreine Sigma-Delta-Kodierungsvorrichtung。
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申请号: EP87480015.4申请日: 1987-10-19
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公开(公告)号: EP0312672A1公开(公告)日: 1989-04-26
- 发明人: Cukier, Maurice , Marciano, Frédérik , Michel, Patrick
- 申请人: International Business Machines Corporation
- 申请人地址: Old Orchard Road Armonk, N.Y. 10504 US
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: Old Orchard Road Armonk, N.Y. 10504 US
- 代理机构: Lattard, Nicole
- 主分类号: H03M1/60
- IPC分类号: H03M1/60 ; H04B14/06
摘要:
Offset correction circuit in a digital-to-analog coder (10) comprising a delta coder (18) providing a serial bit string at a high frequency F in response to digital words supplied at a low frequency f, and an analog integrator (22) providing an analog output signal (24) which is an analog representation of the digital words. The offset correction circuit avoids an offset to be introduced in the analog output of the integrator (22) when a PLO correction is taken to slow down or to speed up the clock controlling the input of the digital words. Such a circuit can be implemented by a state generator which provides a corrected pulse in place of the sigma-delta data which lasts half the duration of the offset.
公开/授权文献
- EP0312672B1 Offset correction circuit for a sigma-delta coding device 公开/授权日:1992-07-22
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