| 摘要 |
A temperature dependent current generating circuit includes a circuitry for producing a first voltage that is substantially constant over temperature, circuitry for producing a second voltage that increases with increasing temperature, wherein the second voltage intersects the first voltage at a predefined temperature, and a comparator circuit receiving the first and second voltages. The comparator circuit is responsive to the first and second voltages to source a compensation current below the predefined temperature; i.e., when the second voltage is below the first voltage, and to sink the compensation current above the predefined temperature; i.e., when the second voltage is above the first voltage. A current generating circuit is operable to divert the compensation current away therefrom at temperatures below the predefined temperature and to produce a charging current at such temperatures only as a function of a base charging current, and to draw the compensation current away from the base charging current at temperatures above the predefined temperature so that the charging current is a decreasing function of temperature at such temperatures.
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