| 摘要 |
<p>In an oscillator in an integrated circuit (IC) the oscillator signal is taken from the output of a comparator (COMP). The decision level of the comparator (CMP) is determined by the voltage difference between the input of the comparator (CMP) and the substrate (SBSTR) of the integrated circuit (IC). The spurious voltage on the substrate (SBSTR), which is caused by digital circuitry (DL), is compensated by means of an equal spurious voltage on the input of the comparator (CMP). To this end an integrated capacitor (C1) is connected between the input of the comparator (CMP) and the substrate (SBSTR). The integrated capacitor (C1) takes the place of the usual external capacitor (C1EXT).</p> |
