发明名称 |
Digital-to-analog converter, analog-to-digital converter, and semiconductor device |
摘要 |
A DA conversion device includes the following elements. A higher-bit current source cell portion includes uniformly weighted higher-bit current source cells to generate an identical constant current. A lower-bit current source cell portion includes a lower-bit current source cells that are weighted to generate 1/two-to-the-power-of-certain-numbers constant currents. A constant current source selection controller includes a lower-bit controller having a scaler that uses clocks scaled down to 1/two-to-the-power-of-certain-numbers to select the lower-bit current source cells, and a higher-bit controller having shift registers and using a signal indicating a carry bit or a borrow bit used in the lower-bit controller to sequentially activate shift outputs of the shift registers, and uses the shift outputs to select the higher-bit current source cells. Constant current outputs of the selected current source cells are added and output so that an output current corresponding to the digital input signal is obtained.
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申请公布号 |
US2008042048(A1) |
申请公布日期 |
2008.02.21 |
申请号 |
US20070974266 |
申请日期 |
2007.10.12 |
申请人 |
SONY CORPORATION |
发明人 |
ASAYAMA GO;FUKUSHIMA NORIYUKI;NITTA YOSHIKAZU;MURAMATSU YOSHINORI;AMANO KIYOTAKA |
分类号 |
H01L27/00;H03M1/12;H03M1/56;H03M1/66;H03M1/68;H03M1/74;H04N5/335;H04N5/357;H04N5/374;H04N5/378 |
主分类号 |
H01L27/00 |
代理机构 |
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代理人 |
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地址 |
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