In-phase combiner and RF recovery system
First Claim
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1. A power amplifier of high frequency RF signals comprising:
- a signal splitter for splitting an input RF signal into plural RF signals related to the input RF signal;
plural power amplifiers each of said amplifiers operatively connected to one of said plural RF signals through one of plural digitally controlled switches;
control means for controlling the operation of said digitally controlled switches in relation to the power of the RF input signal;
plural in-phase signal combiners, one of said combiners combining the signal output from two of the amplifiers and remaining said combiners combining the outputs of one of said amplifiers and one of said combiners to provide an amplified RF signal related to the input RF signal.
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Abstract
A system and method for combining RF signals by a series of in-phase combiners. The system uses a series of switched, high efficiency amplifiers which may be selectively operated to obtain a desired output signal, such as an Amplitude Modulated (AM) signal. The output signals of the amplifiers are combined by a series of in-phase combiners. In a high linearity system a feedback loop is used to correct for combiner losses. The RF power normally lost in the combiners is recovered and available to increase the overall combiner efficiency.
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Citations
11 Claims
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1. A power amplifier of high frequency RF signals comprising:
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a signal splitter for splitting an input RF signal into plural RF signals related to the input RF signal; plural power amplifiers each of said amplifiers operatively connected to one of said plural RF signals through one of plural digitally controlled switches; control means for controlling the operation of said digitally controlled switches in relation to the power of the RF input signal; plural in-phase signal combiners, one of said combiners combining the signal output from two of the amplifiers and remaining said combiners combining the outputs of one of said amplifiers and one of said combiners to provide an amplified RF signal related to the input RF signal.
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2. A system for amplifying high frequency RF signals, comprising:
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a signal splitter for splitting an input RF signal into plural RF signals related to the input RF signal; plural amplifying networks, each network operatively connected to one of said plural RF signals through one of plural digitally controlled switches; plural in-phase system combiners, one of said system combiners combing the signals from two of said amplifying networks and the remaining said combiners combining the signals from one of said amplifying networks and one of said combiners to provide an output RF signal; and switch control means to selectively provide one of the RF signals to each of the plural amplifying networks. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification