Power amplifier arrangement, particularly for mobile radio, and method for determining a performance parameter
First Claim
1. A power amplifier arrangement, comprising:
- a power amplifier comprising an input configured to receive a first radio-frequency signal, a transistor output stage with a control input which is coupled to the input of the power amplifier, and an output configured to deliver a second radio-frequency signal having a current and a voltage associated therewith;
a first element configured to deliver a first signal derived from the voltage of the second radio-frequency signal;
a second element configured to deliver a second signal derived from the current, concurrently with the voltage of the second radio-frequency signal;
an evaluating circuit coupled to the first element and to the second element, and configured to deliver an evaluation signal based on an evaluation of the first and second derived signals;
wherein the second element is configured to detect a current delivered by the transistor output stage, and the first element is configured to concurrently detect a voltage present at an output of the transistor output stage.
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Abstract
A power amplifier arrangement includes a power amplifier with an input for a radio-frequency signal and an output for delivering a second radio-frequency signal. The second radio-frequency signal has a current and a voltage. A second element is configured to deliver a first signal derived from the current of the second radio-frequency signal. Furthermore, a first element is provided to deliver a second signal derived from the voltage of the second radio-frequency signal. An evaluating circuit detects in-phase components of the first and the second signal. As a result, in-phase current and voltage components can be detected together which produce the active power of the second radio-frequency signal by multiplication.
44 Citations
19 Claims
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1. A power amplifier arrangement, comprising:
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a power amplifier comprising an input configured to receive a first radio-frequency signal, a transistor output stage with a control input which is coupled to the input of the power amplifier, and an output configured to deliver a second radio-frequency signal having a current and a voltage associated therewith;
a first element configured to deliver a first signal derived from the voltage of the second radio-frequency signal;
a second element configured to deliver a second signal derived from the current, concurrently with the voltage of the second radio-frequency signal;
an evaluating circuit coupled to the first element and to the second element, and configured to deliver an evaluation signal based on an evaluation of the first and second derived signals;
wherein the second element is configured to detect a current delivered by the transistor output stage, and the first element is configured to concurrently detect a voltage present at an output of the transistor output stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for determining a performance parameter in a power amplifier, comprising:
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providing a signal to be amplified;
amplifying the signal, the amplified signal having a current and a voltage associated therewith;
detecting a voltage derived from the voltage of the amplified signal at a point in time;
detecting a first signal derived from the current of the amplified signal at approximately the same point in time; and
combining the detected voltage and the detected first signal and generating an evaluation signal based thereon. - View Dependent Claims (17, 18, 19)
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Specification