| 摘要 |
An integrated circuit, IC, (1) comprising an integrated reference current generation circuit (2) adapted to generate a reference current (I ref ) for said integrated circuit (1) and having reference voltage sources (1, 9) each supplying a reference voltage via a first and second integrated switch (SW1, SW2) to a corresponding amplifier (10, 12) that is adapted to regulate a control voltage of an integrated transistor (11, 13) connected to the respective amplifier such that the generated reference current (I ref ) is a weighted sum of external currents (I 1 , I 2 ) each flowing through one of said integrated transistors (11, 13) via network connection pins (4-1, 4-2) of said integrated circuit (1) to an external reference resistor network (5) connected to said integrated circuit, IC (1); wherein said network connection pins (4-1, 4-2) are connectable to each other by means of a third integrated switch (SW3) and to a reference potential (GND) by means of said first and second switch (SW1, SW2); and an integrated control circuit (1) adapted to detect a failure in said external reference resistor network (5) on the basis of the monitored external currents (I 1 , I 2 ) and to control said integrated switches (SW1, SW2, SW3) such that the reference current (I ref ) generated by said integrated reference current generation circuit (2) is maintained constant if a failure occurs in said external reference resistor network (5). |
