Current-source arrangement

Details Current-source arrangement Current-source arrangement

G - Physics

05

F

328/203, 330/32,

G05F 3/22 (2006.01)

Patent

CA 1210091

ABSTRACT: Current-source arrangement. A current-source arrangement supplying a current which increases directly proportionally to the supply voltage (VS) and which is suitable for operation with supply voltages above approximately 0.7 V, comprises a first resistor (R10 = R) in which a current (VS-VBE)/R flows, which current is supplied by a first transistor (T10) via a first current-mirror circuit (T11, T12) and a second current-mirror circuit (T13, T14). A second resis- tor (R2 = R) is arranged in parallel with the base-emitter junction of the input transistor (T11) of the first cur- rent-mirror circuit (T11, T12), through which second resistor (R2) a current VBE/R flows which is supplied by the first transistor (T10) via the collector-base inter- connection of the input transistor (T11). The total current flowing through the first transistor (T10) is then equal to VS/R. This current can be taken from the collector ter- minals (15A, 15B) of the transistors (T15A, T15B), whose base-emitter junctions are connected in parallel with the base-emitter junction of the first transistor (T10). Fig. 2.

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