Patent ID: 7498893

Claim:
A differential oscillator circuit for generating a high-frequency electromagnetic oscillation, comprising: an amplifier configuration with two inputs and two outputs, an oscillator crystal connected to the outputs of the amplifier configuration, a bandpass filter configuration with two inputs and two outputs, which is connected, with inputs, to the oscillator crystal and the two outputs of the amplifier configuration connected to the oscillator crystal, and back coupled, with two outputs, to the inputs of the amplifier configuration, wherein, through dimensioning of the amplitude-frequency characteristic or the phase-frequency characteristic of the bandpass filter configuration as a function of the amplitude-frequency characteristic and the phase-frequency characteristic of the amplifier configuration and the oscillator crystal, the oscillation condition is fulfilled exclusively for a selected harmonic of the oscillator crystal, and the high-frequency, electromagnetic oscillation formed by this selected harmonic of the oscillator crystal is available at the output of the bandpass filter configuration.