Analog to digital converter

Details Analog to digital converter Analog to digital converter

1981-09-03

1983-11-15

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347DA, H03K 1302

Patent

active

044158823

ABSTRACT:
The analog output from a local DAC comprising an LDAC and an MDAC, in which the full scale of the LDAC is always larger than the quantized level of the MDAC, is compared with an input analog signal which is sampled and held. A digital code obtained by successive approximation in accordance with the result of the comparison is stored in a successive approximation register. A shift code for calibrating the D/A conversion in the local DAC by shifting the digital code which is previously allotted to each digital code is stored in a shift code generating circuit (ROM). The digital code from the successive approximation register is digitally shifted in accordance with the shift code by a code shift circuit such as a digital adder/subtractor to obtain an A/D conversion output. An analog to digital converter with a high accuracy and an improved conversion speed is inexpensively fabricated in the form of a one chip LSI by a usual CMOS process.

REFERENCES:
patent: 3216001 (1965-11-01), Hinrichs
patent: 3735392 (1973-05-01), Kaneko
patent: 4097753 (1978-06-01), Cook
patent: 4318085 (1982-03-01), Whiteside
Connolly, "1980 IEEE International Solid-State Circuits Conference, Digest of Technical Papers", pp. 12-13, Feb. 13, 1980.

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