Amplifier protection circuit and method
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRichard Hellberg, Rui Hou
Life of this patent
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Abstract
Methods and apparatus are provided. In an example aspect, an amplifier protection circuit is provided. The amplifier protection circuit comprises an input for receiving a signal from a first amplifier, and an isolation circuit between the input and an output of the amplifier protection circuit. The isolation circuit is configured to sense a backward signal propagating from the output of the amplifier protection circuit towards the input to provide a sensed signal, and to provide at least one cancellation signal based on the sensed signal to at least partially cancel the backward signal.
Claims17
An amplifier protection circuit comprising:
- an input for receiving a signal from a first amplifier;
- and
- an isolation circuit between the input and an output of the amplifier protection circuit, wherein the isolation circuit is configured to sense a backward signal propagating from the output of the amplifier protection circuit towards the input to provide a sensed signal, and to provide at least one cancellation signal based on the sensed signal to at least partially cancel the backward signal;
- and
- wherein the isolation circuit comprises a first directional coupler, first sensed signal amplifier, and second sensed signal amplifier, wherein the input of the amplifier protection circuit is connected to an input port of the first directional coupler, an output of the first sensed signal amplifier is provided to a coupled port of the first directional coupler, an output of the second sensed signal amplifier is provided to a transmitted port of the first directional coupler, and an isolated port of the first directional coupler is connected to the output of the amplifier protection circuit, and wherein the first and second sensed signal amplifiers are configured to provide signals at the outputs of the first and second signal amplifiers based on the sensed signal.
An amplifier protection circuit comprising:
- an input for receiving a signal from a first amplifier;
- and
- an isolation circuit between the input and an output of the amplifier protection circuit, wherein the isolation circuit is configured to sense a backward signal propagating from the output of the amplifier protection circuit towards the input to provide a sensed signal, and to provide at least one cancellation signal based on the sensed signal to at least partially cancel the backward signal;
- wherein the isolation circuit comprises a first transmission line and a second transmission line, a first end of the first transmission line is connected to the input of the amplifier protection circuit, a second end of the first transmission line is connected to the output of the amplifier protection circuit, and the isolation circuit is configured to provide the sensed signal to a first end of the second transmission line, and
- wherein the isolation circuit comprises a plurality of amplifiers, wherein inputs of the plurality of amplifiers are distributed along the second transmission line, and outputs of the plurality of amplifiers are distributed along the first transmission line, and wherein each amplifier provides a respective cancellation signal to the first transmission line to partially cancel the backward signal.
Dependencies are inferred from the claim text.