to extend the life of the battery in such cases where the transceiver circuit 10 is used in a battery powered device fig2 shows a circuit diagram of a driver circuit 100 which is implemented for example in cmos technology the driver circuit 100 has a first input terminal 105 to which a digital input signal t u00d7 d transmit data signal is applied a second input terminal 110 to which a first reference current i ref1 is applied and an output terminal 115 at which the driver current i diode is output the driver circuit 100 also includes a switching device mn 1 mp 1 a measuring transistor mps an output transistor mp 0 and three current mirrors cm 1 cm 2 and cm 3 in the example of embodiment described here both the measuring transistor mps and the output transistor mp 0 are pmos transistors or p channel mosfets to the source of which a supply voltage v dd is applied the drain terminal of the output transistor mp 0 is connected to the output terminal 115 of the driver circuit 100 the gate terminal of both the measuring transistor mps and of the output transistor mp 0 are.