| 摘要 |
<p>A current generator (10) comprises a PNP transistor (T1) and an NPN transistor (T2). A base of one of the transistors is connected to a collector of the other transistor. A first and a second current regulating resistor (R1) is connected between an emitter of the PNP transistor and a first connection point (1) and an emitter of the NPN transistor and a second connection point (2), respectively. A first (D1, D2) and second (D3, D4) voltage reference means is configured to give a voltage reference to the base of respective transistor if a current flows through the current generator. The current generator comprises a first (3) and/or second (4) potential controlling means. The potential controlling means are configured to allow defining of a potential at the base of a respective transistor. Thereby, the current through the circuit starts to flow when the first and second potential controlling means defines a potential that is lower and higher, respectively, than a potential of the first and second connection point, respectively.</p> |
