Circuit arrangement for voltage reversal in a mobile radio apparatus

Circuit arrangement for generating an output voltage (V-) with respect to a Bezugspotenial (P) first polarity in one with an operating voltage (V +) with respect to the Bezugspotenial (P) second polarity supplied mobile device via a circuit input terminal (E2, E) with a call signal generator supply voltage (Vclk) is supplied. A preferred embodiment operates on the basic operating principle that by means of a voltage increase on a coil (L) after their Stromlosschalten a first capacitor (C1) is charged to a positive voltage relative to the fixed reference potential (P). During the on-phase of the transistor, the first capacitor charges a second capacitor (C2) to a voltage which is negative with respect to the fixed reference potential (P) and which can be tapped from the outside.