发明授权
- 专利标题: Digital-to-analog converter switching circuitry
- 专利标题(中): 数模转换器开关电路
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申请号: US10670160申请日: 2003-09-23
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公开(公告)号: US06909390B2公开(公告)日: 2005-06-21
- 发明人: Ramin Khoini-Poorfard , Douglas R. Frey
- 申请人: Ramin Khoini-Poorfard , Douglas R. Frey
- 申请人地址: US TX Austin
- 专利权人: Silicon Laboratories, Inc.
- 当前专利权人: Silicon Laboratories, Inc.
- 当前专利权人地址: US TX Austin
- 代理机构: Davis & Associates
- 代理商 William D. Davis
- 主分类号: H03M1/06
- IPC分类号: H03M1/06 ; H03M1/08 ; H03M1/66
摘要:
A digital-to-analog converter circuit for a subscriber line analog front end includes a differential amplifier, switch circuitry, and first and second current steering digital-to-analog converters (DAC), each DAC having a first and second output forming a differential DAC output. The switch circuitry couples the differential output of at most a selected one of the first and second DACs to a pair of switch nodes. When the differential output of the selected DAC is coupled to the pair of switch nodes, the differential output of the other DAC is shorted. A differential input of the differential amplifier is communicatively coupled to the pair of switch nodes. A differential output of the differential amplifier is coupled to drive a tip line and a ring line of a subscriber line. In various embodiments, the DACs, switch circuitry, and differential amplifier reside on the same semiconductor substrate.
公开/授权文献
- US20040119621A1 Digital-to-analog converter switching circuitry 公开/授权日:2004-06-24
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