Patent ID: 7474131

Claim:
A driver circuit for generating an output current for charging or discharging a load connected to the driver circuit, which output current has the least harmonics possible and is, in particular, sin 2 -shaped, said driver circuit being operable at an operating voltage and comprising: at least one driver transistor, which is connected to the load, said driver transistor further including at least one gate node; and at least one circuit block, which is designed for the control, in particular for the variable control, of the voltage at the gate node of the driver transistor, said circuit block being connected to said gate node, the circuit block having a transistor, whose drain terminal is coupled to the gate node of the driver transistor, the voltage between the gate terminal of the transistor and the source terminal of the transistor being kept essentially constant, the circuit block having a first voltage source, which provides the operating voltage of the driver circuit, the circuit block having a second voltage source, which is coupled to the source terminal of the transistor and which provides a load control voltage which enables the driver circuit to be adapted to different load magnitudes independently of the operating voltage provided by the first voltage source, the circuit block having a third voltage source, which defines the voltage between the gate terminal and the source terminal of the transistor, whose drain terminal is coupled to the gate node of the driver transistor.