| 摘要 |
An arrangement (1) for converting voltage (Vin) into current (Iout), implemented on a chip (100), comprises a first V/I converter (3), the operation of which is based on a conversion resistor (Rconv) formed on the chip. This resistor has an unknown fabrication tolerance (alpha). This is compensated for by the presence of a second V/I converter (13) having a compensation resistor (Rcomp), which is also formed on the chip and which has the same fabrication tolerance (alpha). Furthermore, a third V/I converter (23) is present, which operates on the basis of an external resistor (Rref). The second V/I converter (13) converts a reference voltage (Vref) into a compensation current signal (Icomp), and the third V/I converter (23) converts the reference voltage (Vref) into a reference current signal (Iref). The output current (Iout) is provided by multiplying an output current signal (I1) of the first V/I converter (3) by a factor which is proportional to the reference current signal (Iref) and which is inversely proportional to the compensation current signal (Icomp).
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