发明名称 |
Current source circuit and amplifier using the same |
摘要 |
There is provided a current source circuit in which a outflow current of an output terminal is equal to an inflow current thereof. The current source circuit includes a first transistor group converting a reference current from a reference current source into a voltage and a first transistor having a current mirror relationship with the first transistor group, and allowing an output current to flow therethrough. An error amplifier compares a voltage generated in the first transistor group and supplied to one input terminal with a voltage supplied to the other input terminal. A second transistor is driven with an output voltage of the error amplifier. A third transistor is driven with the output voltage of the error amplifier, and allows an output current to flow therethrough in a direction opposite to the output current of the first transistor with respect to an output terminal. A second transistor group converts a current flowing through the second transistor into a voltage to supply the voltage to the other input terminal of the error amplifier.
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申请公布号 |
US2005134366(A1) |
申请公布日期 |
2005.06.23 |
申请号 |
US20050054796 |
申请日期 |
2005.02.10 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
OZASA MASAYUKI;SHIMAOKA HIROYASU |
分类号 |
G05F3/26;H03F3/343;H03F3/345;H03F3/45;(IPC1-7):G05F1/10 |
主分类号 |
G05F3/26 |
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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