Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-06-16
2000-01-11
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455127, 455401, H04B 116
Patent
active
060145749
ABSTRACT:
A circuit configuration for producing an output voltage having a first polarity with respect to a reference potential, in a mobile radio transceiver supplied with an operating voltage having a second polarity with respect to the reference potential, includes a circuit input terminal for a ringing signal generator supply voltage. A preferred embodiment operates according to a fundamental functional principle of charging a first capacitor to a positive voltage with respect to the fixed reference potential through the use of a voltage overshoot at a coil after the latter has been deenergized. During an on phase of a transistor, the first capacitor charges a second capacitor to a negative voltage with respect to the fixed reference potential. The negative voltage can be picked off externally.
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Meier Thomas
Schoepf Klaus-Jurgen
Eisenzopf Reinhard J.
Greenberg Laurence A.
Lerner Herbert L.
Nguyen Duc
Siemens Aktiengesellschaft
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