RF power amplifier
First Claim
1. An RF power amplifier comprising:
- an RF power amplifying section having a variable amplification gain;
a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to the output signal of the RF power amplifying section and an output terminal subjected to a signal which results from shifting the phase of the output signal of the RF power amplifying section;
generating means for generating a control signal on the basis of the signals at the input terminal and the output terminal of the phase shifter, the control signal representing a power of the output signal of the RF power amplifying section; and
means for controlling the amplification gain of the RF power amplifying section in response to the control signal,wherein the generating means comprises a first detector for detecting a portion of the signal at the input terminal of the phase shifter, a second detector for detecting a portion of the signal at the output terminal of the phase shifter, and adder for adding an output signal of the first detector and an output signal of the second detector, and means for generating the control signal on the basis of an output signal of the adder.
1 Assignment
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Accused Products
Abstract
An RF power amplifier includes an RF power amplifying section having a variable amplification gain. A phase shifter connected to the RF power amplifying section serves to shift a phase of an output signal of the RF power amplifying section. The phase shifter has an input terminal subjected to the output signal of the RF power amplifying section and an output terminal subjected to a signal which results from shifting the phase of the output signal of the RF power amplifying section. A control-signal generating section serves to generate a control signal on the basis of the signals at the input terminal and the output terminal of the phase shifter. The control signal depends on a power of the output signal of the RF power amplifying section. The amplification gain of the RF power amplifying section is controlled in response to the control signal.
13 Citations
28 Claims
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1. An RF power amplifier comprising:
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an RF power amplifying section having a variable amplification gain; a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to the output signal of the RF power amplifying section and an output terminal subjected to a signal which results from shifting the phase of the output signal of the RF power amplifying section; generating means for generating a control signal on the basis of the signals at the input terminal and the output terminal of the phase shifter, the control signal representing a power of the output signal of the RF power amplifying section; and means for controlling the amplification gain of the RF power amplifying section in response to the control signal, wherein the generating means comprises a first detector for detecting a portion of the signal at the input terminal of the phase shifter, a second detector for detecting a portion of the signal at the output terminal of the phase shifter, and adder for adding an output signal of the first detector and an output signal of the second detector, and means for generating the control signal on the basis of an output signal of the adder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An RF power amplifier comprising:
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an RF power amplifying section having a variable amplification gain; a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to a first signal, said first signal being the output signal of the RF power amplifying section, and an output terminal subjected to a second signal, said second signal being the output signal of the RF power amplifying section phase shifted by the phase shifter, wherein said first signal includes first and second varying components having first and second amplitudes respectively corresponding to amplitudes of a traveling wave and a reflected wave and said second signal includes third and fourth varying components having said first and second amplitudes; a first detector for detecting a portion of the signal at the input terminal of the phase shifter; a second detector for detecting a portion of the signal at the output terminal of the phase shifter; generating means responsive to an output signal of the first detector and an output signal of the second detector for generating a control signal which increases monotonically with said second amplitude between minimum and maximum values when a standing wave is present; and gain control means responsive to said control signal for controlling the amplification gain of the RF power amplifying section in response to the control signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An RF power amplifier comprising:
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an RF power amplifying section having a variable amplification gain; a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to the output signal of the RF power amplifying section and an output terminal subjected to a signal which results from shifting the phase of the output signal of the RF power amplifying section; generating means for generating a control signal on the basis of the signals at the input terminal and the output terminal of the phase shifter, the control signal representing a power of the output signal of the RF power amplifying section; and means for controlling the amplification gain of the RF power amplifying section in response to the control signal, wherein said generating means comprises first and second linear detecting means respectively connected to said input and output terminals of said phase shifter and adding means for adding output signals of said first and second linear detecting means and for producing an output signal proportional to a sum of amplitudes of said output signal of the RF power amplifying section and the signal shifted by said phase shifter. - View Dependent Claims (22, 23)
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24. An RF power amplifier comprising:
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an RF power amplifying section having a variable amplification gain; a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to a first signal, said first signal being the output signal of the RF power amplifying section, and an output terminal subjected to a second signal, said second signal being the output signal of the RF power amplifying section phase shifted by the phase shifter, wherein said first signal includes first and second varying components having first and second amplitudes respectively corresponding to amplitudes of a traveling wave and a reflected wave and said second signal includes third and fourth varying components having said first and second amplitudes; generating means responsive to the signals at the input terminal and the output terminal of the phase shifter for generating a control signal representative of a power of the output signal of the RF power amplifying section which increases monotonically with said second amplitude between minimum and maximum values when a standing wave is present; and gain control means responsive to said control signal for controlling the amplification gain of the RF power amplifying section to maintain the power of the output signal of the RF power amplifying section substantially at a predetermined constant level. - View Dependent Claims (25, 26, 27)
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28. An RF power amplifier comprising:
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an RF power amplifying section having a variable amplification gain; a phase shifter connected to the RF power amplifying section for shifting a phase of an output signal of the RF power amplifying section, the phase shifter having an input terminal subjected to a first signal, said first signal being the output signal of the RF power amplifying section, and an output terminal subjected to a second signal, said second signal being the output signal of the RF power amplifying section phase shifted by the phase shifter, wherein said first signal includes first and second varying components having first and second amplitudes respectively corresponding to amplitudes of a traveling wave and a reflected wave and said second signal includes third and fourth varying components having said first and second amplitudes a first detector for detecting a portion of the signal at the input terminal of the phase shifter; a second detector for detecting a portion of the signal at the output terminal of the phase shifter; generating means responsive to an output signal of the first detector and an output signal of the second detector for generating a control signal representing a power of the output signal of the RF power amplifying section which increases monotonically between minimum and maximum values with said second amplitude when a standing wave is present; and gain control means responsive to said control signal for controlling the amplification gain of the RF power amplifying section in response to the control signal to maintain the power of the output signal of the RF power amplifying section essentially at a predetermined constant level.
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Specification