An amplifier for amplifying a signal which is applied to a signal input having a first pair of transistors (10), which is connected to the signal input and which contains two transistors (10-1, 10-2), currents flowing through the two transistors (10-1, 10-2) which have a specific operating current ratio (m) in relation to one another, a second pair of transistors (4), which is connected to the first pair of transistors (10) and which contains two transistors (4-1, 4-2), currents flowing through the two transistors (4-1, 4-2) which have the same operating current ratio (m) in relation to one another, and a signal output (3) of the amplifier (1) being provided between the first pair of transistors (10) and the second pair of transistors (4).
