Method and apparatus for analog/digital conversion

Details Method and apparatus for analog/digital conversion Method and apparatus for analog/digital conversion

1993-06-09

1994-05-31

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 140

Patent

active

053173139

ABSTRACT:
In an A/D converter for electrical signals, the difference, between the instantaneous analog input signal Y(t) and a previous analog signal value Y(t-T), is converted in a fast analog-to-digital converter (3) to a digital sum value. This sum value is added to the preceding digital value, stored in a buffer memory (7, 7'), and the result is fed to a slow but precise D/A converter (2) for generation of the next Y(t-T) value. This has the advantage that good results can be obtained with A/D converters less expensive than those heretofore required to obtain such results.

REFERENCES:
patent: 4994806 (1991-02-01), Yun-Tae
patent: 5101205 (1992-03-01), yasuda
patent: 5241312 (1993-08-01), Long
Analog Devices, Data Sheet on Component AD9028/AD9038, pp. 1-12, published Apr. 1989, Norwood, Mass.
Mitsubishi Semiconductors, Data Sheet on Components M5M5257P and M5M5257AP, pp. 3-65 & 3-70 in catalog entitled "Mitsubishi Semiconductors 1992 Memories SRAM," published Mar. 1992, Tokyo, Japan.

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