发明名称 |
HYBRID DIGITAL-TO-ANALOG CONVERSION SYSTEM |
摘要 |
A digital-to-analog conversion (DAC) circuit has a resistor ladder circuit controlled by high order bits and a resistor string circuit controlled by low order bits. The resistor ladder circuit includes a stem resistor and a branch resistor. The stem resistor has a stem resistance, and the branch resistor has a branch resistance that is substantially equal to two times of the stem resistance. The resistor string circuit includes a string current source, a string resistor, and a bridge resistor. The string current source is configured to generate a string current that is based on a ratio of a reference voltage divided by a predetermined resistance. The string resistor has a string resistance that corresponds to the predetermined resistance, and it is configured to selectively receive the string current based on a selection signal decoded from the low order bits. |
申请公布号 |
US2016301421(A1) |
申请公布日期 |
2016.10.13 |
申请号 |
US201615189048 |
申请日期 |
2016.06.22 |
申请人 |
Texas Instruments Incorporated |
发明人 |
Shill Mark Allan |
分类号 |
H03M1/78;H03M1/76 |
主分类号 |
H03M1/78 |
代理机构 |
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代理人 |
|
主权项 |
1. A digital-to-analog conversion (DAC) circuit comprising:
a string current source having a string current output lead; a resistor string having a string resistor coupled across a high string node and a low string node, the string resistor having a string resistance based on a predetermined resistance associated with a reference voltage divided by a string current of the string current source; a string switch circuit coupled between the string current output lead and the string resistor responsive to a digital input signal; and a bridge resistor coupled between the high string node of the resistor string and a string output node outside of the resistor string, the bridge resistor having a bridge resistance based on the string resistance. |
地址 |
Dallas TX US |