Constant current circuit
AssigneesSanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
InventorFuminori Hashimoto
Life of this patent
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Abstract
In order to prevent interference of signals in a plurality of outputs from a current mirror circuit, the current mirror circuit comprises a current mirror input transistor Q1 through which a constant current flows and a plurality of current mirror output transistors Q7 and Q8 which have control ends commonly connected to a control end of the current mirror input transistor Q1. The constant current is supplied from the plurality of current mirror output transistors Q7 and Q8 to a plurality of operating circuits. Further, at least one of the plurality of current mirror output transistors Q7 and Q8 is equipped with a low pass filter for removing a high-frequency component contained in a current output from the at least one of the plurality of current mirror output transistors Q7 and Q8.
Claims5
A constant current circuit for supplying a constant current to a plurality of operating circuits, comprising:
- a current mirror input transistor through which the constant current flows;
- and
- a plurality of current mirror output transistors which have control ends commonly connected to a control end of the current mirror input transistor, and supply the constant current to the plurality of operating circuits, wherein
- at least one of the plurality of current mirror output transistors is equipped with a low pass filter for removing a high-frequency component contained in a current output from the at least one of the plurality of current mirror output transistors.
Dependencies are inferred from the claim text.