发明名称 |
High resolution and low consumption digital-analog converter |
摘要 |
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 (DeltaV1). 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 (DeltaV2) equal to ½L of the product of the first voltage step (DeltaV1) 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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申请公布号 |
US2004233089(A1) |
申请公布日期 |
2004.11.25 |
申请号 |
US20040791663 |
申请日期 |
2004.03.02 |
申请人 |
STMICROELECTRONICS S.R.L. |
发明人 |
CONFALONIERI PIERANGELO;NICOLLINI GERMANO;MARTIGNONE RICCARDO |
分类号 |
H03M1/66;H03M1/68;H03M1/74;H03M1/76;(IPC1-7):H03M1/66 |
主分类号 |
H03M1/66 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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