发明名称 |
SELF-TRIMMING CURRENT SOURCE AND METHOD FOR SWITCHED CURRENT SOURCE DAC |
摘要 |
A self-trimming current source for used in a switched current source DAC is made from a fixed current source and a variable current source, which are connected in parallel to provide a total output current. The total output current is automatically calibrated by temporarily switching one side of the self-trimming current source to a measurement circuit. Based on the measured value, the variable current source is adjusted to make the total output current equal to a predetermined value. The fixed current source is implemented with a complementary pair of field-effect transistors (FETs) connected in a cascode connection, with the two drain terminals presenting high impedances to the circuitry to which they are connected. A DAC typically includes a plurality of self-trimming current sources, each of which is calibrated during each DAC conversion cycle. |
申请公布号 |
EP1388210(A2) |
申请公布日期 |
2004.02.11 |
申请号 |
EP20010955022 |
申请日期 |
2001.07.31 |
申请人 |
ROCKWELL SCIENTIFIC LICENSING LLC |
发明人 |
SONG, BANG-SUP;BUGEJA, ALEX R. |
分类号 |
H03M1/10;H03M1/74 |
主分类号 |
H03M1/10 |
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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