Semiconductor device
AssigneeOki Electric Industry Co., Ltd.
InventorsMasafumi Nagaya, Masahiko Nakajikkoku
Life of this patent
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Abstract
A semiconductor device has a start-up circuit which comprises a third node (N3), a first switch (103A) which electrically connects a first node (N1) and an input terminal (102I) of a second mirror circuit (102) based on a voltage level at the third node; a second switch (103B) which electrically connects the first node and the third node based on a voltage level at an input terminal (101I) of a first current mirror circuit (101); and a third switch (103C) which electrically connects the first node and the third node based on an inverted voltage level at the third node.
Claims12
A semiconductor device comprising:
- a first node which is provided a first voltage;
- a second node which is provided a second voltage, wherein said second voltage is lower than said first voltage;
- a first current mirror circuit which has an input terminal and an output terminal, wherein said first current mirror circuit is coupled with said first node;
- a second current mirror circuit which has an input terminal and an output terminal, wherein said input terminal of said second current mirror circuit is coupled with said output terminal of said first current mirror circuit, wherein said output terminal of said second current mirror circuit is coupled with said input terminal of said first current mirror circuit and wherein said second current mirror circuit is coupled with said second node;
- and
- a start-up circuit which includes
- a third node,
- an inverter which is connected to said third node,
- a first switch which connects said first node and said input terminal of said second current mirror circuit based on voltage on said third node,
- a first transistor to which is located between the first and third nodes, and which supplies a current at the first node to the third node based on a voltage on the input terminal of the first current mirror circuit, and
- a second switch which connects said first node and said third node based on an inverted voltage of the voltage on said third node.
A semiconductor device, comprising:
- a first node which is provided a first voltage;
- a second node which is provided a second voltage, wherein said second voltage is lower than said first voltage;
- a first current mirror circuit which is coupled with said first node;
- a second current mirror circuit which is coupled with said second node, wherein said second current mirror circuit is coupled with said first current mirror circuit through a third node and a fourth node;
- a start-up circuit which includes
- a fifth node,
- an inverter which is connected to said fifth node,
- a first switch which connects said first node and said fourth node based on voltage on said fifth node,
- a first transistor which is located between the first and fifth nodes, and which supplies a current of the first node to the fifth node based on a voltage on the third node, and
- a second switch which connects said first node and said fifth node based on an inverted voltage of the voltage on said fifth node.
Dependencies are inferred from the claim text.