Patent ID: 6014574
Filing Date: 2000-01-11
Classification: H02M,H04M,Y02D

Abstract:
In a mobile radio transceiver supplied with an operating voltage having a second polarity with respect to a fixed reference potential and having a ringing signal generator, a circuit configuration for producing an output voltage having a first polarity with respect to the fixed reference potential, comprising:a circuit input terminal for a ringing signal generator supply voltage in the form of an AC voltage or pulsed voltage for driving the ringing signal generator in the event of an incoming call;a first circuit input terminal for the operating voltage, and a second circuit input terminal for the ringing signal generator supply voltage;a transistor having a control terminal coupled to said second circuit input terminal, and a load path with first and second load path terminals, the second load path terminal coupled to the fixed reference potential;a coil coupled between the first load path terminal and said first circuit input terminal;first and second diodes each having an anode and a cathode, the cathode of said first diode coupled to the anode of said second diode and the cathode of said second diode coupled to the fixed reference potential;a first capacitor coupled between the first load path terminal and the cathode of said first diode;second capacitor coupled between the fixed reference potential and the anode of said first diode; anda circuit output terminal for the output voltage being connected to the anode of said first diode.