Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-11-14
2008-03-25
Nguyen, Linh (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000, C341S153000
Reexamination Certificate
active
07348912
ABSTRACT:
A digital-to-analog converter includes a first section (MSB) that converts the more significant bits of a digital code into a first voltage (Vin) of a multiplicity of discrete voltages that are integral multiples of a predetermined first voltage step (ΔV1). A second section (LSB) of the converter converts the less significant bits of the digital code into a current. The current is transformed into a second voltage of a multiplicity of discrete voltages that are integral multiples of a second voltage step (ΔV2) equal to ½ L of the product of the first voltage step (ΔV1) multiplied by a predetermined coefficient, where L is the number of the less significant bits of the digital code to be converted. A summer generates an output voltage (Vout) that is the sum of the second voltage and the product of the first voltage multiplied by the predetermined coefficient. With a view to obtaining a low consumption, the summer has a resistive feedback circuit including a voltage divider (R3, R4). A conversion resistor (R4) that forms part of the voltage divider transforms the current into the second voltage.
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European Search Report, EP 03 42 5260, dated Aug. 14, 2003.
Confalonieri Pierangelo
Martignone Riccardo
Nicollini Germano
Gardere Wynne & Sewell LLP
Nguyen Linh
STMicroelectronics S.r.l.
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