High resolution and low consumption digital-to-analog converter

Details High resolution and low consumption digital-to-analog converter High resolution and low consumption digital-to-analog converter

2008-03-25

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

11272937

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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