Constant current circuit
First Claim
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1. A constant current circuit, comprising:
- first and second depression type MOS transistors having drains connected to a high electric potential side; and
first, second, and third enhancement type MOS transistors having sources connected to a low electric potential side;
wherein a source of the first depression type MOS transistor and a drain of the first enhancement type MOS transistor are connected so that a first connection is formed,a gate of the first depression type MOS transistor and a gate of the first enhancement type MOS transistor are connected so that a second connection is formed;
the second connection and the first connection are connected so that a third connection is formed;
a source of the second depression type MOS transistor and a drain of the second enhancement type MOS transistor are connected via a resistance so that a fourth connection is formed;
a gate of the second depression type MOS transistor and a gate of the second enhancement type MOS transistor are connected so that a fifth connection is formed;
the fifth connection and the first connection are connected so that a sixth connection is formed;
a gate of the third enhancement type MOS transistor is connected to the fourth connection between the drain of the second enhanced type MOS transistor and the resistance so that a seventh connection is formed; and
a drain of the third enhancement type MOS transistor is an output end of the constant current circuit.
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Abstract
A constant current circuit includes first and second depression type MOS transistors having drains connected to a high electric potential side; and first, second, and third enhanced type MOS transistors having sources connected to a low electric potential side.
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Citations
8 Claims
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1. A constant current circuit, comprising:
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first and second depression type MOS transistors having drains connected to a high electric potential side; and first, second, and third enhancement type MOS transistors having sources connected to a low electric potential side; wherein a source of the first depression type MOS transistor and a drain of the first enhancement type MOS transistor are connected so that a first connection is formed, a gate of the first depression type MOS transistor and a gate of the first enhancement type MOS transistor are connected so that a second connection is formed; the second connection and the first connection are connected so that a third connection is formed; a source of the second depression type MOS transistor and a drain of the second enhancement type MOS transistor are connected via a resistance so that a fourth connection is formed; a gate of the second depression type MOS transistor and a gate of the second enhancement type MOS transistor are connected so that a fifth connection is formed; the fifth connection and the first connection are connected so that a sixth connection is formed; a gate of the third enhancement type MOS transistor is connected to the fourth connection between the drain of the second enhanced type MOS transistor and the resistance so that a seventh connection is formed; and a drain of the third enhancement type MOS transistor is an output end of the constant current circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current AssigneeRICOH Electronic Devices Co., Ltd. (Nisshinbo Holdings Incorporated)
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Original AssigneeRicoh Company Limited
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InventorsNegoro, Takaaki
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Primary Examiner(s)TRA, ANH QUAN
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Application NumberUS11/703,734Publication NumberTime in Patent Office698 DaysField of Search327/538, 327/540, 327/541, 327/543US Class Current327/543CPC Class CodesG05F 3/10 using uncontrolled devices ...G05F 3/30 Regulators using the differ...
