Output data correction device for analog-to-digital...

Details Output data correction device for analog-to-digital... Output data correction device for analog-to-digital...

2008-03-26

2009-12-29

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S144000

Reexamination Certificate

active

07639164

ABSTRACT:
An output data correction device is provided for an A/D conversion circuit that achieves high precision over input voltage domains. An estimated maximum input ranging from 0 V to 5 V is divided into domains. A comparison circuit decides to which of the domains a voltage Vin input to a pulse phase-difference encoding circuit belongs. Control logic and a digital analog controller (DAC) select and transmit reference voltages associated with each of the domains. When each of the reference voltages is selected, a quadratic functional equation is computed and determined. A graph of the function passes coordinate points representing the reference voltages in a coordinate system with reference voltages and A/D-converted data values as dimensions. When each input voltage is selected, the A/D-converted digital data is corrected using the quadratic functional equation associated with the domain to which the input voltage Vin is decided to belong.

REFERENCES:
patent: 5933199 (1999-08-01), Yoon
patent: 6861967 (2005-03-01), Tanizawa

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