发明名称 |
Multi-input operational amplifier circuit, digital/analog converter using same, and driver for display device using same |
摘要 |
A multi-input operational amplifier circuit operable with a high degree of accuracy and in a small area, a D/A converter using the multi-input operational amplifier circuit, and a drive circuit or driver for a display device, using the D/A converter. In embodiments of the multi-input operational amplifier circuit, a constant current source of a third differential amplifier circuit that causes a doubled constant current i×2 to flow with respect to constant current sources of first and second differential amplifier circuits by application of two types of bias voltages thereto is configured using PMOS of the same number and size. Therefore, operations equivalent to those of a conventional circuit may be realized by the three constant current source PMOSs, and a smaller chip size may be required. |
申请公布号 |
US8063808(B2) |
申请公布日期 |
2011.11.22 |
申请号 |
US20080206189 |
申请日期 |
2008.09.08 |
申请人 |
YAMAZAKI KOJI;HIGUCHI KOJI;OKI SEMICONDUCTOR CO., LTD. |
发明人 |
YAMAZAKI KOJI;HIGUCHI KOJI |
分类号 |
H03M1/68 |
主分类号 |
H03M1/68 |
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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