Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1995-01-10
1997-04-15
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341150, H03M 302
Patent
active
056214073
ABSTRACT:
A .DELTA..SIGMA. digital/analog converter comprising an interpolator for sampling an input digital signal at a desired ratio, a noise-shaping coder for quantizing an output signal from the interpolator into the coded bits and modulating a quantization error generated in the quantization, a differentiator for detecting an intersignal variation from an output signal from the noise-shaping coder, the intersignal variation indicating a difference between previous and present digital signal values, a digital logic unit for generating a desired control signal according to the intersignal variation detected by the differentiator, an internal digital/analog converter for performing charging and discharging operations in response to the desired control signal from the digital logic unit to output an analog signal corresponding to the input digital signal, and a filter for filtering an output signal from the internal digital/analog converter to remove a mixed noise therefrom. According to the present invention, a minimized number of passive devices is used to reduce an error amount resulting from a process deviation, miniaturize a chip and easily enhance the internal bits without expanding the chip size.
REFERENCES:
patent: 5196850 (1993-03-01), Duffy et al.
patent: 5412387 (1995-05-01), Vincelette et al.
patent: 5467089 (1995-11-01), Draxelmayr
Jeong Deog-Kyoon
Kim Daejeong
Goldstar Electron Co. Ltd.
Hoff Marc S.
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