| 摘要 |
The invention concerns a load pump device able to provide a constant current, respectively positive or negative, over an extremely wide output voltage range. A symmetrical switching system activates a first operational amplifier (AOP1) associated with the positive current source or a second amplifier (AOP2) associated with the negative current source according to predetermined threshold values (Vref), the first amplifier being provided so as to restore the behavior of the current mirror (M2, M1) generating a positive current when the output voltage of the device approaches the feed voltage (VDD) and the second amplifier being provided so as to restore the behavior of the current mirror (M4, M3) generating a negative current when the output voltage of the device approaches the earth (GND), thus allowing the output current of the device to be always constant and equal to a reference value (Iref).
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