Data processing device and data processing system

Details Data processing device and data processing system Data processing device and data processing system

2010-03-24

2011-12-13

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

C341S118000, C341S120000, C341S155000

Reexamination Certificate

active

08077065

ABSTRACT:
In AD conversion of a voltage under measurement, data continuity is ensured between the result of conversion after amplification by using an amplifier circuit and the result of direct conversion without using the amplifier circuit. In AD conversion operation using a DA converter circuit, an amplifier circuit, and an AD converter circuit under the direction of a control circuit, an analog signal output from the DA converter circuit is directly converted by the AD converter circuit, and also the analog signal is converted therein after amplified by the amplifier circuit with an expected gain of 2n(“n” represents a positive integer). Based on resultant data thus obtained, a gain of the amplifier circuit and an offset thereof are calculated. An analog signal under measurement to be enhanced in bit precision is subjected to amplification by the amplifier circuit and conversion by the AD converter circuit, the offset calculated as mentioned above is subtracted from the result of the conversion, and the result of the subtraction thus performed is multiplied by a ratio of the expected gain to the gain calculated as mentioned above so as to cancel a gain error. Then, based on data with the gain error canceled, acquisition of bit-extended conversion result data is performed to ensure continuity between data having different degrees of bit precision.

REFERENCES:
patent: 5422643 (1995-06-01), Chu et al.
patent: 6720902 (2004-04-01), Stimmann
patent: 7146283 (2006-12-01), Daigle et al.
patent: 2000-174622 (2000-06-01), None
patent: 2001-102927 (2001-04-01), None

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