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US 7,095,985 B1Granted
Radio transmitter and receiver
AssigneeSiemens Aktiengesellschaft
InventorLudwig Hofmann
Life of this patent
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Abstract
Radio transceiver, in particular, a mobile telephone having a transmitter output stage, a receiver part, a transmission/reception antenna which is assigned jointly to the transmitter output stage and the receiver part, a transmission band-transmitting filter and a reception band-transmitting filter, having a compensation element, connected between the output of the transmitter output stage and the input of the receiver part, for compensating crosstalk of a transmission signal element onto the receiver part.
Claims6
A radio transceiver comprising:
- a transmitter output stage;
- a receiver part;
- a transmission/reception antenna which is jointly assigned to the transmitter output stage and the receiver part;
- a transmission band-transmitting filter which is connected between the output of the transmitter output stage and an antenna feedpoint;
- a reception band-transmitting filter which is connected between the antenna feedpoint and the input of the receiver part;
- a compensation element which is connected between the output of the transmitter output stage and the input of the receiver part and compensates crosstalk from a transmission signal element onto the receiver part;
- and
- a compensation control unit to adaptively set compensation characteristics as a function of the input voltage or input power at the input of the receiver part being assigned to the compensation element, wherein a voltage measuring device which is connected to the compensation control unit measures the input voltage of the receiver part, the voltage measuring device comprising a device for IF conversion of the input signal of the receiver part, a bandpass filter which is connected downstream and an AM receiver part which is connected to its output and whose output is used to set the compensation characteristics.
5 more elements
Dependencies are inferred from the claim text.