Impedance matching for a power amplifier system
First Claim
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1. A system which adjusts impedance of a power amplifier system, comprising:
- a first power amplifier amplifying a communication signal;
a bias controller for outputting a control signal, the bias controller coupled to a communication device such that the communication signal is sensed;
a second power amplifier responsive to the control signal, such that the bias controller activates the second power amplifier when an amplitude of the communication signal is at least equal to a predetermined amplitude, and such that the bias controller deactivates the second power amplifier when the amplitude of the communication signal is less than the predetermined amplitude; and
a prematching impedence network coupled to at least the second power amplifier such that when the bias controller activates the second power amplifier the prematching impedance network adjusts a system impedance to a first value when the first power amplifier is activated, and such that when the bias controller deactivates the second power amplifier the prematching impedance network adjusts the system impedance to a second value when the first power amplifier and the second power amplifier are activated.
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Abstract
One embodiment is a method for adjusting impedance of a power amplifier system comprising combining an output of a first power amplifier with an output of a second power amplifier via a coupler that couples an output connection of the first power amplifier with an output connection of the second power amplifier, wherein a prematching impedance network coupled to the second power amplifier adjusts a system impedance to a first value when the second power amplifier is not actuated, and wherein the prematching impedance network adjusts the system impedance to a second value when the second power amplifier is actuated.
22 Citations
16 Claims
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1. A system which adjusts impedance of a power amplifier system, comprising:
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a first power amplifier amplifying a communication signal;
a bias controller for outputting a control signal, the bias controller coupled to a communication device such that the communication signal is sensed;
a second power amplifier responsive to the control signal, such that the bias controller activates the second power amplifier when an amplitude of the communication signal is at least equal to a predetermined amplitude, and such that the bias controller deactivates the second power amplifier when the amplitude of the communication signal is less than the predetermined amplitude; and
a prematching impedence network coupled to at least the second power amplifier such that when the bias controller activates the second power amplifier the prematching impedance network adjusts a system impedance to a first value when the first power amplifier is activated, and such that when the bias controller deactivates the second power amplifier the prematching impedance network adjusts the system impedance to a second value when the first power amplifier and the second power amplifier are activated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
a first portion of the prematching impedance network is coupled to an input of the first power amplifier;
a second portion of the prematching impedance network is coupled to an input of the second power amplifier; and
an input matching impedance and coupler coupled between a transmit unit providing the communication signal and the first portion of the prematching impedance network, and coupled between the transmit unit and the second portion of the prematching impedance network.
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6. The system of claim 1, further comprising:
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a first portion of the prematching impedance network is coupled to an input of the second power amplifier;
a second portion of the rematching impedance network is coupled to an output of the second power amplifier, and an input matching impedance and coupler coupled between a transmit unit providing the communication signal and the first portion of the prematching impedance network, and coupled between the transmit unit and the second portion of the prematching impedance network.
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7. The system of claim 1, further comprising:
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a first portion of the prematching impedance network is coupled to an input of the first power amplifier;
a second portion of the prematching impedance network is coupled to an input of the second power amplifier;
a third portion of the prematching impedance network is coupled to an output of the second power amplifier, and an input matching impedance and coupler coupled between a transmit unit providing the communication signal and the first portion of the prematching impedance network, and coupled between the transmit unit and the second portion of the prematching impedance network.
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8. A method for adjusting impedance of a power amplifier system, the method comprising the steps of:
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combining an output of a first power amplifier with an output of a second power amplifier via a coupler that couples an output connection of the first power amplifier with an output connection of the second power amplifier;
adjusting a prematching impedance network coupled to the second power amplifier adjusts a system impedance to a first value when the second power amplifier is not actuated; and
adjusting the prematching impedance network to a second value when the second power amplifier is actuated. - View Dependent Claims (9, 10, 11, 12)
adjusting the prematching impedance network to a first impedance when the second power amplifier is not actuated; and
adjusting the prematching impedance network to a second impedance when the second power amplifier is actuated.
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10. The method of claim 8, further comprising the steps of:
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adjusting the prematching impedance network to a first phase angle when the second power amplifier is not actuated; and
adjusting the prematching impedance network to a second phase angle when the second power amplifier is actuated.
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11. The method of claim 8, further comprising the step of coupling the prematching impedance network to an input of the second power amplifier.
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12. The method of claim 8, further comprising the step of coupling the prematching impedance network to the output of the second power amplifier.
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13. A system for adjusting impedance of a power amplifier system, comprising:
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means for combining output of a first power amplifier with an output of a second power amplifier via a coupler that couples an output connection of the first power amplifier with an output connection of the second power amplifier; and
a prematching impedance network means coupled to the second power amplifier for adjusting a system impedance to a first value when the second power amplifier is not actuated, and for adjusting a system impedance to a second value when the second power amplifier is actuated. - View Dependent Claims (14, 15, 16)
means for adjusting the prematching impedance network to a first phase angle when the second power amplifier is not actuated; and
means for adjusting the prematching impedance network to a second phase angle when the second power amplifier is actuated.
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Specification