| 摘要 |
A current source circuit includes a first transistor (11) having an output current which is sensed across a resistance connected between the emitter of the first transistor (11) and the negative side of the supply voltage. A series negative feedback loop comprising transistors (13, 15) is connected between the emitter of first transistor (11) and the base of first transistor (11). The transistors (11, 13 and 15) and the other circuit components are selected so as to result in an incremental output resistance approaching that of a cascode current source, while having a voltage drop across the circuit of substantially less than 1 volt.
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