A circuit for broadband amplification is provided. The circuit includes an input HF_IN and an output HF_OUT, a first 90.degree. hybrid coupler being connected to the input HF_IN of the circuit and a second 90.degree. hybrid coupler being connected to the output HF_OUT of the circuit, and two amplifier stages being connected in parallel between the first and the second 90.degree. hybrid coupler, the 90.degree. hybrid couplers being hybrid couplers having an operating range of 1/n octaves between a lower frequency value and an upper frequency value, n.epsilon.N{0}, i.e., n is an element of the natural positive whole numbers in such a way that the upper frequency value is greater than the lower frequency range and simultaneously less than two times the value of the lower frequency range, and the amplifier stages being based on transistors having a III-nitride, or SiC, or diamond basis.