Constant current supply device

Details Constant current supply device Constant current supply device

2005-10-11

2005-10-11

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

Reexamination Certificate

active

06954058

ABSTRACT:
In a current mirror circuit, a compensation resistor having a positive temperature coefficient is connected between the source of a MOS transistor and a power supply line. When the temperature rises, a current output by the constant current circuit and a current flowing through the drain of the MOS transistor decrease. Since the resistance of the compensation resistor increases, however, a voltage between the gate and source of another MOS transistor can be prevented from declining due to the decrease in the drain current so that an electric potential at the gate of a further MOS transistor, hence, a main current, can be prevented from fluctuating. In addition, a constant current output circuit is configured to shunt a feedback control current thereby to adjust an output current of each channel.

REFERENCES:
patent: 4088941 (1978-05-01), Wheatley, Jr.
patent: 6087821 (2000-07-01), Kojima
patent: A-2000-124743 (1912-04-01), None
patent: A-5-35352 (1993-02-01), None
patent: A-2002-91589 (2002-03-01), None
patent: A-2002-236521 (2002-08-01), None

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