Patent ID: 6590460
Filing Date: 2003-07-08
Classification: H03K

Abstract:
A harmonic distortion-attenuated oscillator circuit, comprising:a controllable oscillator amplifier for generating an oscillator output signal; and an amplitude control circuit for controlling an amplitude of the oscillator output signal and for generating an amplitude control signal for controlling the controllable oscillator amplifier as a function of a determined amplitude of the oscillator output signal such that the controllable oscillator amplifier functions in a predefined operating range having an approximately linear amplification characteristic at a preset operating point, wherein: the controllable oscillator amplifier is designed such that the predefined operating range and the preset operating point are independent of the amplitude control signal, and the amplitude control circuit includes: a comparator circuit for producing a pulse width modulation signal by comparing the determined amplitude of the oscillator output signal to a predefined threshold value, and a low-pass filter to which the pulse width modulation signal is fed to generate the amplitude control signal.