Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1993-11-09
1995-06-20
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341161, H03M 138
Patent
active
054264316
ABSTRACT:
Disclosed is an analog/digital (A/D) converter, which comprises an M-bit resistor-string type digital/analog (D/A) converter, a charge re-distribution type N-bit D/A converter, a comparator, a successive approximation register for storing the output of the comparator, and first and second switch controllers for respectively controlling the two D/A converters in accordance with the output of the successive approximation register. The N-bit D/A converter uses voltages at both ends a and b of an arbitrary unit resistor of the resistor string of the M-bit D/A converter as reference voltages. The comparator has a differential amplifier whose one input terminal is connected to a capacitor for sampling an analog input signal. The output of the N-bit D/A converter is connected to the other input terminal of the differential amplifier. As the differential amplifier is used in the comparator and the N-bit D/A converter of a charge re-distribution type is used instead of a resistor-string type, the number of components and the area of the A/D converter can be reduced considerably. Even if the number of bits increases, therefore, an increase in pellet area will be suppressed.
REFERENCES:
patent: 4385286 (1983-05-01), Haque
patent: 5038143 (1991-08-01), Hester
NEC Corporation
Young Brian K.
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