AD converter

Details AD converter AD converter

2006-04-18

2006-04-18

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S158000

Reexamination Certificate

active

07030802

ABSTRACT:
An AD converter having a series resistor arranged to generate at each of connection points a reference voltage to convert an analog value to a digital value, and semiconductor switches each constituted by a parallel combination of a PMOSFET and an NMOSFET and disposed one for each of the connection points, the AD converter, while applying a first voltage to a first gate electrode of the PMOSFET to bring the PMOSFET into conduction and a second voltage higher than the first voltage to a second gate electrode of the NMOSFET to bring the NMOSFET into conduction, generating the digital value on the basis of results of comparing the analog value with the reference voltages output from the semiconductor switches, comprises a control circuit operable at least either to step down the first voltage applied to the first gate electrode or to step up the second voltage applied to the second gate electrode.

REFERENCES:
patent: 5734342 (1998-03-01), Mes
patent: 6504499 (2003-01-01), Masenas et al.
patent: 06-120828 (1994-04-01), None

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