method for matching a two - point - from modulator and two point modulator with a abgleichvorrichtung

摘要

A PLL circuit ( 1 ) is regulated by means of a digital modulation signal ( 28 ) at a first frequency, and is then regulated at a second frequency, by deactivation of the digital modulation signal ( 28 ). A difference signal ( 32 ), which is characteristic of the voltage change in a control signal ( 22 ) for the VCO ( 7 ) which is produced by deactivation of the digital modulation signal ( 28 ) is compared with an analog modulation signal ( 34 ). The analog modulation signal ( 34 ) is changed so as to correct any discrepancy determined during the comparison.