- Patent Title: Area efficient digital to analog and analog to digital converters
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Application No.: US15600462Application Date: 2017-05-19
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Publication No.: US09887703B1Publication Date: 2018-02-06
- Inventor: Jun Zhang , Xuan Wang
- Applicant: Texas Instruments Incorporated
- Applicant Address: US TX Dallas
- Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee: TEXAS INSTRUMENTS INCORPORATED
- Current Assignee Address: US TX Dallas
- Agent Gregory J. Albin; Charles A. Brill; Frank D. Cimino
- Main IPC: H03M1/10
- IPC: H03M1/10 ; H03M1/12 ; H03M1/80 ; H03M1/00

Abstract:
A digital-to-analog converter (DAC) for converting an M bit digital value to an analog signal includes a capacitive DAC and a resistive DAC. The capacitive DAC is configured to convert N most significant bits of the digital value to an analog signal. The resistive DAC is configured to covert M-N least significant bits (LSBs) of the digital value to an analog signal. The resistive DAC includes a coarse DAC and a fine DAC. The coarse DAC is configured to convert a most significant R bits of the M-N least significant bits to an analog signal. An output of the coarse DAC is switchably coupled to a first capacitor of the capacitive DAC. The fine DAC is configured to convert M-N-R least significant bits of the M-N least significant bits to an analog signal. An output of the fine DAC is switchably coupled to a second capacitor of the capacitive DAC.
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