| 摘要 |
A current source circuit produces a temperature stable current IOUT as the sum of a first current from a circuit A and a second current from a circuit B. The two currents have opposite temperature dependence. In circuit A, the base-emitter voltage of a transistor 3 is applied across a known resistor 5. The resulting current is stabilised by feedback through transistors 4,2 and then reflected into transistor 1. Circuit B includes a bandgap circuit 11-16 and output transistor 10. The device may be constructed as an integrated circuit operable at 0.9 volts, and may be used in a portable radio or mobile telephone.
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