Invention Grant
- Patent Title: Integrated weighted current digital to analog converter
- Patent Title (中): 集成加权电流数模转换器
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Application No.: US492973Application Date: 1983-06-01
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Publication No.: US4482887APublication Date: 1984-11-13
- Inventor: Guy L. Crauwels
- Applicant: Guy L. Crauwels
- Applicant Address: NY Armonk
- Assignee: International Business Machines Corporation
- Current Assignee: International Business Machines Corporation
- Current Assignee Address: NY Armonk
- Main IPC: H03M1/00
- IPC: H03M1/00 ; H03K13/02
Abstract:
A weighted current digital to analog converter (DAC) translates digital bits to corresponding analog signals by a suitably operated transfer circuit of (1) multiple parallel current sources for more significant bits and (2) binary weighted current sources for lesser significant bits. The number of resistors and the ratio of adjacent resistors is reduced in the transfer circuit relative to a ladder type DAC. Power saving and linearity are improved by the reduced number and ratio of adjacent resistors. The transfer circuit facilitates fabrication of the DAC in a semiconductor. Temperature stability is improved by proper location of the current sources in the semiconductor.
Public/Granted literature
- US5024437A Golf club head Public/Granted day:1991-06-18
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