CIRCUIT ARRANGEMENT FOR CORRECTING TOLERANCES

摘要

The invention relates to a circuit arrangement for correcting manufacturing tolerances. A demodulator (DEM) has a resistor (R) and a capacitor (C) which may have tolerances. The FM demodulator (DEM) is preferably supplied with a reference frequency (F) corresponding to the set middle frequency of the demodulator (DEM), which is dependent on the resistor (R) and the capacitor (C) for tolerance correction. A deviation of the actual middle frequency of the demodulator (DEM) from the set middle frequency results in the voltage (U) at the output deviating from a set voltage (S). A detector (DET) detects this deviation and adjusts the resistor (R) or capacitor (C) values until the deviation between the set voltage and the voltage (U) is zero or minimal. The invention is suitable for use e.g., in integrated mobile radiotelephone receivers.