Current mirror circuit and method for providing zero temperature

Details Current mirror circuit and method for providing zero temperature Current mirror circuit and method for providing zero temperature

1986-06-30

1987-06-16

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

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

323907, G05F 326

Patent

active

046738673

ABSTRACT:
A resistively trimmed current mirror circuit including a diode coupled in parallel to the base-emitter conduction path of a transistor and to which a reference current is supplied to produce a proportional output current at the collector of the transistor. A trimmable resistor is connected in the collector-emitter conduction path of the transistor which is adjusted to vary the output current for a given reference current to trim the ratio between the two currents. By making the reference current a thermal current, i.e., a current whose magnitude is proportional to thermal voltage and inversely proportional to resistance, the trimmed ratio remains temperature independent after being trimmed to a desired value.

REFERENCES:
patent: 4435678 (1984-03-01), Joseph et al.
patent: 4596960 (1986-06-01), Hitomi
patent: 4600965 (1986-07-01), Sato et al.

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