Abstract: An oscillator circuit for generating a high-frequency electromagnetic oscillation, comprises:—an amplifier configuration with at least one input and at least one output,—an oscillator crystal connected to at least one of the outputs of the amplifier configuration,—a bandpass filter configuration, which is connected, with at least one input, to the oscillator crystal and the at least one output of the amplifier configuration connected to the oscillator crystal, and back coupled, with at least one output, to the input, or at least one of the inputs, of the amplifier configuration.