发明名称 |
A/D conversion method for serial/parallel A/D converter, and serial/parallel A/D converter |
摘要 |
The present invention provides a serial/parallel A/D converter which is capable of performing a high-speed and high-accuracy operation even in the case where an analog input voltage Vin greatly varies in a period between a previous sampling period in which the analog input voltage is held and the next sampling period, when converting the analog input voltage Vin input into a digital value. This serial/parallel A/D converter includes a lower-order reference voltage initializing circuit 8 for initializing a lower-order reference voltage to an initialization voltage Vrc 23. The initialization voltage Vrc 23 is generated as the lower-order reference voltage in an arbitrary period from the start of sampling of the analog input voltage until the start of a comparison operation for the lower-order reference voltage, the value of the lower-order reference voltage is changed from the value of the initialization voltage to a voltage value which is decided on the basis of higher-order code selection signals P0C-P3C from a higher-order code selecting circuit 14, and the value of the lower-order reference voltage which is decided on the basis of the higher-order code selection signals P0C-P3C is compared with the value of the analog input voltage.
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申请公布号 |
US6741192(B2) |
申请公布日期 |
2004.05.25 |
申请号 |
US20030615391 |
申请日期 |
2003.07.09 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
MURATA KENJI;NOMASAKI DAISUKE |
分类号 |
H03M1/14;H03M1/36;(IPC1-7):H03M9/00 |
主分类号 |
H03M1/14 |
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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