Invention Grant
US09563730B2 Improving the accuracy of an exponential current digital-to-analog converter (IDAC) using a binary-weighted MSB
有权
使用二进制加权MSB提高指数型数模转换器（IDAC）的精度
- Patent Title: Improving the accuracy of an exponential current digital-to-analog converter (IDAC) using a binary-weighted MSB
- Patent Title (中): 使用二进制加权MSB提高指数型数模转换器（IDAC）的精度
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Application No.: US14166097Application Date: 2014-01-28
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Publication No.: US09563730B2Publication Date: 2017-02-07
- Inventor: Louis De Marco , Pier Cavallini
- Applicant: Dialog Semiconductor GmbH
- Applicant Address: GB Reading
- Assignee: Dialog Semiconductor (UK) Limited
- Current Assignee: Dialog Semiconductor (UK) Limited
- Current Assignee Address: GB Reading
- Agency: Saile Ackerman LLC
- Agent Stephen B. Ackerman
- Priority: EP14368013 20140114
- Main IPC: H05B37/02
- IPC: H05B37/02 ; G06F17/50 ; H05B33/08 ; H03M1/74
Abstract:
An apparatus of an exponential current digital-to-analog converter (IDAC) using a binary-weighted MSB to efficiently drive current controlled light emitting diode (LED) devices. The apparatus comprises of an exponential current digital-to-analog converter (IDAC) current source, a voltage buffer to create an active cascode at the output stage, and an error amplifier that by means of a DC-DC converter voltage loop imposes an appropriate voltage at the output of the IDAC, depending on the current load set to drive the LEDs. The definition of the apparatus involves defining an exponential LSB and exponential MSB current mirrors according to a defined methodology.
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