1. A tunable oscillator circuit provided with a pair of oscillator transistors whose bases are connected crosswise to the opposite collectors, and a capacitance which is arranged between the emitters of the oscillator transistors, each emitter being connected via an emitter current source to a reference voltage, characterized by a pair of buffer transistors in common base configuration, whose two collectors are connected via a pair of collector resistors to a supply voltage and constitute an output of the tunable oscillator circuit, said pair of buffer transistors being arranged in a cascode configuration with the pair of oscillator transistors, the emitter current of the buffer transistors being equal to the sum of the base and collector currents of the oscillator transistors.