Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2008-01-25
2009-12-01
Williams, Howard (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S164000
Reexamination Certificate
active
07626532
ABSTRACT:
An A/D converter comprises a ramp voltage generation circuit, a voltage comparison circuit comprising an arithmetic unit comparing an analog voltage to be converted with a reference voltage showing the voltage change of a ramp voltage, and changing an output when the reference voltage equals the analog voltage, a counter counting and outputting a digital value corresponding to the reference voltage, a latch circuit latching and outputting the digital value when the output of the voltage comparison circuit changes, an averaging process circuit to obtain an average noise voltage, a target noise voltage setting circuit setting a target noise voltage, and a control circuit adjusting at least one of a counting start timing of the counter with respect to a control reference timing, or the criterion level of the reference voltage at the counting start timing, based on a difference between the average noise voltage and the target noise voltage.
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Birch & Stewart Kolasch & Birch, LLP
Sharp Kabushiki Kaisha
Williams Howard
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