Wien-bridge Oscillator And Circuit Arrangement For Regulating A Detuning

Abstract

Disclosed are a wien-bridge oscillator and a circuit arrangement for regulating a detuning. An oscillator circuit includes the Wien-bridge oscillator. A non-detuned oscillating signal and a detuned oscillating signal are tapped from the Wien-bridge oscillator. A sum of a weighted detuned signal and a weighted non-detuned signal is coupled as feedback signal to the Wien-bridge to control the oscillation amplitude.

Description

technical field [0001] The present invention generally relates to Wien bridge oscillators and circuit arrangements. Background technique [0002] In many circuits including so-called integrated circuits (ie, ICs), fully integrated oscillators are required for generating reference clock signals with high frequency accuracy and with very low temperature and long-term drift. Clock signal generators are known to be used in various applications, for example in digital signal processing circuits. A high-precision clock signal generator is usually used in analog-to-digital conversion equipment, that is, it is used to sample an analog signal to generate a corresponding digital signal. [0003] In conventional applications and for this purpose a relaxation oscillator is used, which presents low complexity and can be easily adjusted or programmed. However, frequency drift usually does not result solely from parameter variations of the main passive frequency determining elements such...

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Problems solved by technology

[0030] 2. The phase shift at the oscillation frequency must have positive feedback

Drifts caused by temperature variations and variations in process parameters can have a significant effect on the accuracy of the oscillation frequency, as they often result in significant variations in the gain and phase offset of amplifier circuits

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