Constant current generating circuit

Details Constant current generating circuit Constant current generating circuit

1997-01-13

1998-05-26

Tso, Edward

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323317, 323312, G05F 316

Patent

active

057571759

ABSTRACT:
A current source is provided between a first p channel MOS transistor and a ground node, and a current/voltage converting element is provided isolatedly from the current source between the ground node and a second p channel MOS transistor having a conductance coefficient sufficiently larger than that of the first MOS transistor. The second MOS transistor is connected through a resistive element to an external power supply node. A voltage produced by the current/voltage converting element is converted into current by a voltage/current converting portion. Thus, constant current free from both vibration and a deadlock phenomenon and with small external power supply voltage dependency is supplied.

REFERENCES:
patent: 4901002 (1990-02-01), Simon
patent: 5180976 (1993-01-01), Yamazaki
patent: 5448159 (1995-09-01), Kojima et al.

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