Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

2011-06-07

2011-06-07

Nguyen, Khai M (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000, C341S155000

Reexamination Certificate

active

07956778

ABSTRACT:
There is provided an analog-to-digital converter capable of performing analog-to-digital conversion with good accuracy. The analog-to-digital converter in accordance with the present invention includes a dither generation circuit11which generates dither; an input polarity switching unit1which switches a polarity of an input signal; an integrator2; an integrator output regulator circuit5which regulates an output voltage of the integrator2; a window comparator3; a control circuit4which uses the comparison result of the window comparator3to control the input polarity switching unit1, the integrator output regulator circuit5, and the window comparator3as well as to generate a digital signal. The dither generation circuit11generates dither in such a manner that a cycle in which the digital signal is read is an integral multiple of a dither cycle. Further, the dither generation circuit11generates dither in such a manner that the number of times the count value is generated in the first half of one cycle of the dither is different from the number of times the count value is generated in the second half cycle thereof.

REFERENCES:
patent: 4395701 (1983-07-01), Evans
patent: 4766417 (1988-08-01), Takayama et al.
patent: 5245343 (1993-09-01), Greenwood et al.
patent: 5416481 (1995-05-01), Chen
patent: 7750612 (2010-07-01), Yokosawa
patent: 2007/0115037 (2007-05-01), Yokosawa
patent: 7-58907 (1995-06-01), None
patent: 2007-139700 (2007-06-01), None

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