PTAT current source

Details PTAT current source PTAT current source

1993-08-27

1996-01-02

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

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

327350, G05F 326

Patent

active

054811805

ABSTRACT:
A PTAT current source has first and second current mirror circuits, each comprising a cascode transistor, an output transistor in series with the cascode transistor, and a base current compensating transistor having a control element connected to the cascode transistor on a side away from the output transistor, and a current flow path element connected to a current control element of the output transistor, the cascode transistors of the first and second current mirror circuits having differently sized emitter areas. A resistor is connected between the cascode transistors of the first and second current mirror circuits across which a differential current is developed. An output circuit develops a current in the output transistor of the second current mirror circuit. In one embodiment, a third mirror circuit is provided, to cancel a portion of an emitter current flowing in the output transistor of the second current mirror circuit.

REFERENCES:
patent: 4583037 (1986-04-01), Sooch
patent: 4835487 (1989-05-01), Doyle et al.
patent: 4897596 (1990-01-01), Hughes et al.
patent: 5087891 (1992-02-01), Cytera
patent: 5245273 (1993-09-01), Greaves et al.
patent: 5257039 (1993-10-01), Chung et al.

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