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Registered MULTI-BIT SIGMA-DELTA MODULATOR AND DIGITAL-TO-ANALOG CONVERTER WITH ONE DIGITAL-TO-ANALOG CAPACITOR

단일 DAC 캐패시터를 이용한 멀티 비트 시그마 델타 변조기
이미지 확대
Inventors
Kim Yi-Gyeong, Cho Min-Hyung, Kwon Jong-Kee, Seung-Chul Lee, Kim Gyu Hyun, Kim Jongdae
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.
KSP Keywords
3-Level, Analog Converter, Digital to Analog Converter, Non-Linearity, Operational Amplifiers(Op-Amps), Sigma-Delta, Single-Ended, Switched Capacitor(SC), Switching method, delta modulator, digital-to-analog(DAC), sigma-delta modulator