Amplification in presence of a variable antenna impedance
First Claim
1. An apparatus comprising:
- a balanced power amplifier including;
a first power amplifying path and a second power amplifying path, the first power amplifying path including a first power amplifier, the second power amplifying path including a second power amplifier;
a quadrature output power combiner having an input port, a coupled port, and an isolated port, the input port and the coupled port respectively coupled to the first power amplifying path and the second power amplifying path;
detection circuitry including at least one power detector and a resistor, the resistor coupled between the isolated port and a ground, the at least one power detector coupled to the isolated port, the at least one power detector configured to measure power at the isolated port, the power based on a resistance of the resistor; and
control circuitry coupled to the first power amplifying path, the second power amplifying path, and the detection circuitry, the control circuitry configured to adjust operating conditions of the first power amplifier and the second power amplifier based on the power that is measured at the isolated port.
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Abstract
In an example aspect, an apparatus includes a balanced power amplifier, which performs amplification in the presence of a variable antenna impedance. The balanced power amplifier includes a quadrature output power combiner coupled to a first power amplifying path and a second power amplifying path, detection circuitry, and control circuitry. The detection circuitry includes at least one power detector coupled to an isolated port of the quadrature output power combiner and a resistor coupled between the isolated port and a ground. The at least one power detector is configured to measure power at the isolated port, which is based on a resistance of the resistor. The control circuitry is configured to adjust operating conditions of a first power amplifier of the first power amplifying path and the second power amplifier of the second power amplifying path based on the power that is measured at the isolated port.
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Citations
30 Claims
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1. An apparatus comprising:
a balanced power amplifier including; a first power amplifying path and a second power amplifying path, the first power amplifying path including a first power amplifier, the second power amplifying path including a second power amplifier; a quadrature output power combiner having an input port, a coupled port, and an isolated port, the input port and the coupled port respectively coupled to the first power amplifying path and the second power amplifying path; detection circuitry including at least one power detector and a resistor, the resistor coupled between the isolated port and a ground, the at least one power detector coupled to the isolated port, the at least one power detector configured to measure power at the isolated port, the power based on a resistance of the resistor; and control circuitry coupled to the first power amplifying path, the second power amplifying path, and the detection circuitry, the control circuitry configured to adjust operating conditions of the first power amplifier and the second power amplifier based on the power that is measured at the isolated port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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an antenna having an impedance; and a balanced power amplifier including; an output node coupled to the antenna; a first power amplifying path including a first power amplifier; a second power amplifying path including a second power amplifier; a quadrature output power combiner having an input port, an output port, a coupled port, and an isolated port, the input port and the coupled port respectively coupled to the first power amplifying path and the second power amplifying path, the output port coupled to the output node; detection means for performing three measurements that are indicative of a reflection coefficient, the reflection coefficient based on the impedance of the antenna, the detection means coupled to the isolated port of the quadrature output power combiner; and control means for adjusting operating conditions of the first power amplifier and the second power amplifier based on the reflection coefficient. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An apparatus comprising:
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an antenna having an impedance; bias voltage circuitry configured to provide a first bias voltage and a second bias voltage; a power supply configured to provide a first supply voltage and a second supply voltage; and a balanced power amplifier including; an output node coupled to the antenna; an input node configured to obtain a communication signal; a quadrature input power splitter having an input port coupled to the input node, an output port, and a coupled port; a quadrature output power combiner having another input port, another output port coupled to the output node, and another coupled port; a first power amplifying path coupled between the coupled port of the quadrature input power splitter and the input port of the quadrature output power combiner, the first power amplifying path including a first power amplifier configured to amplify the communication signal using the first bias voltage and the first supply voltage; a second power amplifying path coupled between the input port of the quadrature input power splitter and the coupled port of the quadrature output power combiner, the second power amplifying path including a second power amplifier configured to amplify the communication signal using the second bias voltage and the second supply voltage; and control circuitry coupled to the bias voltage circuitry and the power supply, the control circuitry configured to; cause the bias voltage circuitry to adjust both the first bias voltage and the second bias voltage based on the impedance of the antenna; and cause the power supply to adjust both the first supply voltage and the second supply voltage based on the impedance of the antenna. - View Dependent Claims (23, 24, 25, 26)
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27. A method for amplification in presence of a variable antenna impedance, the method comprising:
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performing a first power measurement by detecting a power at an isolated port of a quadrature output power combiner implemented within a balanced power amplifier, the balanced power amplifier including two power amplifying paths respectively coupled to an input port of the quadrature output power combiner and a coupled port of the quadrature output power combiner; performing a second measurement and a third measurement within the balanced power amplifier; determining a magnitude and a sign of a reflection coefficient based on the first measurement, the second measurement, and the third measurement; and adjusting operating conditions of the two power amplifying paths based on the reflection coefficient. - View Dependent Claims (28, 29, 30)
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Specification