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Registered MULTI-BIT SIGMA-DELTA MODULATOR AND DIGITAL-TO-ANALOG CONVERTER WITH ONE DIGITAL-TO-ANALOG CAPACITOR
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MULTI-BIT SIGMA-DELTA MODULATOR AND DIGITAL-TO-ANALOG CONVERTER WITH ONE DIGITAL-TO-ANALOG CAPACITOR
- Inventors
- Kim Yi-Gyeong, Kim Gyu Hyun, Kim Jongdae, Seung-Chul Lee, Kwon Jong-Kee, Cho Min-Hyung
- Application No.
- 11588455 (2006.10.27)
- Publication No.
- 20070126615 (2007.06.07)
- Registration No.
- 7388533 (2008.06.17)
- Country
- UNITED STATES
- Project Code
- 05MB1100, Development of semiconductor circuit design based on the nano-scaled device, Kim Jongdae
- Abstract
- A digital-to-analog converter (DAC) for a sigma-delta modulator is provided. The DAC has a switched capacitor structure using an operational amplifier (OP amp) and performs a function exceeding 3-level using a switching method employing only one capacitor in single ended form. Thus, DAC non-linearity caused by capacitor mismatching does not occur, and the number of output levels of the DAC is increased. Also, the DAC capacitor may be applied to a general DAC to increase the ratio of DAC output levels to capacitors.