Patent ID: 7501887

Claim:
A controllable amplifier, comprising: an input for supplying a radio-frequency signal (IN) which is to be amplified; a control input for supplying a control signal for the desired overall gain (CTRL); an output for provision of an amplified signal (OUT); a first current path which comprises a first transistor connected as a source follower; a second current path which comprises a second transistor connected as a source follower, with the second current path being connected in parallel with the first current path; and means for controlling the second current path which couples the control input to the second transistor, where the input is connected to respective control inputs of the first and second transistors, where the output is formed in a connecting node of the first and second current paths, and where the first current path comprises a further first transistor, and the second current path comprises a further second transistor to form a differential amplifier in the first and second current paths, where the input is connected to respective control inputs of the further first and further second transistors.