Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1996-10-29
1997-12-09
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, H03M 142
Patent
active
056965117
ABSTRACT:
In a pipeline type A/D converter, a sample/hold.cndot.subtracter circuit of an A/D converter block of a first stage samples an analog voltage and outputs an offset voltage at a first phase, and subtracts an output voltage of an A/D converter from the sampled analog voltage in a second phase. An A/D converter of an A/D converter block of a succeeding stage subtracts the output voltage of the sample/hold.cndot.subtracter circuit of the first phase from the output voltage of the sample hold.cndot.subtracter circuit of the second phase, and converts the subtracted result into a digital code. The influence of an offset of a differential amplifier included in the sample/hold.cndot.subtracter circuit is removed so that A/D conversion of high accuracy is allowed.
REFERENCES:
patent: 5572212 (1996-11-01), Levinson et al.
patent: 5594445 (1997-01-01), Ginetti
"A10-b 20-Msample/s Analog-to-Digital Converter", Lewis et al., IEEE Journal of solid-state Circuits, vol. 27, No. 3 Mar. 1992, pp. 351-358.
"A13-b 2.5MHz Self-Calibrated Pipeline A/D Converter in 3-um CMOS", Lin et al., IEEE Journal of Solid-State Circuits, vol. 26, No. 4 Apr. 1991, pp. 628-636.
Kumamoto Toshio
Matsumoto Osamu
Mitsubishi Denki & Kabushiki Kaisha
Young Brian K.
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