an output terminal the transistor differential pair is coupled to a current mirror a first level shifting circuit and a second level shifting circuit stabilize the d c voltage levels on the mutually coupled main electrodes of the differential pair and the current mirror respectively consequently the influence of the early effect on the differential pair is suppressed and an improved linear signal transmission is obtained from the input terminal to the output terminal the level shifting circuit also provides a base current compensation in order to produce a high input impedance and the second level shifting circuit provides a base current compensation for equal adjusting currents through the differential pair to reduce any offset voltage application_number US 66784591 A description the prior art amplifier arrangement represented in fig1 shows a differential pair composed of a first transistor n1 and a second transistor n2 whose mutually coupled emitters are coupled to a first supply terminal 1 by means of a current source il the bases of the transistors n1 and n2 are coupled respectively to an input terminal 3 for supplying an input signal vin and to an output terminal 4 for tapping an output signal vout the collectors of the transistors n1 and n2 are coupled to respective input and output terminals of a current mirror circuit which terminals are constituted by the collectors of a third transistor pl and a.