Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Patent
1985-02-26
1986-08-12
Wong, Peter S.
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
323269, 323303, G05F 320
Patent
active
046058923
ABSTRACT:
A current-source arrangement supplying a current which increases directly proportionally to the supply voltage (V.sub.S) and which is suitable for operation with supply voltages above approximately 0.7 V, comprises a first resistor (R.sub.10 =R) in which a current (V.sub.S -V.sub.BE)/R flows, which current is supplied by a first transistor (T.sub.10) via a first current-mirror circuit (T.sub.11, T.sub.12) and a second current-mirror circuit (T.sub.13, T.sub.14). A second resistor (R.sub.2 =R) is arranged in parallel with the base-emitter junction of the input transistor (T.sub.11) of the first current-mirror circuit (T.sub.11, T.sub.12), through which second resistor (R.sub.2) a current V.sub.BE /R flows which is supplied by the first transistor (T.sub.10) via the collector-base interconnection of the input transistor (T.sub.11). The total current flowing through the first transistor (T.sub.10) is then equal to V.sub.S /R. This current can be taken from the collector terminals (15A, 15B) of the transistors (T.sub.15A, T.sub.15B), whose base-emitter junctions are connected in parallel with the base-emitter junction of the first transistor (T.sub.10).
REFERENCES:
patent: 4172992 (1979-10-01), Culmer et al.
patent: 4443753 (1984-04-01), McGlinchey
Seevinck Evert
Van Tuijl Adrianus J. M.
Briody Thomas A.
Rich Marianne R.
Streeter William J.
U.S. Philips Corporation
Wong Peter S.
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