Low power consumption adaptive power amplifier
First Claim
1. A power amplifier circuit comprising:
- a scalable power amplifier including an output, and a plurality of selectively activated amplifier elements each operative to produce an RF output signal at the output, and operative to dynamically vary a power output level of the RF output signal; and
a variable impedance circuit coupled to the output of the scalable power amplifier, and operatively responsive to the power output level data to vary an impedance of the variable impedance circuit to dynamically load the output of the scalable power amplifier.
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Accused Products
Abstract
A power amplification circuit (10) includes a scalable power amplifier (20) to produce an RF output signal (50) at an output of the power amplification circuit (10), and a variable impedance circuit (30) coupled to the output of the power amplification circuit (10). The scalable power amplifier (20) includes a plurality of selectively activated amplifier elements (22), (24), (26) to produce the RF output signal (50) in accordance with a desired RF output signal power level. The power amplification circuit (10) selectively activates individual amplifier elements by, for example reducing power or increasing power to at least one amplifier element. The variable impedance circuit (30) varies an impedance of the variable impedance circuit (30) to dynamically load the output of the scalable power amplifier(20).
44 Citations
22 Claims
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1. A power amplifier circuit comprising:
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a scalable power amplifier including an output, and a plurality of selectively activated amplifier elements each operative to produce an RF output signal at the output, and operative to dynamically vary a power output level of the RF output signal; and
a variable impedance circuit coupled to the output of the scalable power amplifier, and operatively responsive to the power output level data to vary an impedance of the variable impedance circuit to dynamically load the output of the scalable power amplifier. - View Dependent Claims (2, 3, 4, 5)
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6. A power amplifier circuit operative to receive an RF input signal and to produce an RF output signal comprising:
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a device configuration circuit operatively responsive to power output level data to provide a device configuration signal and a variable load impedance signal and, a scalable power amplifier including an output, and a plurality of selectively activated amplifier elements, each operative to receive the RF input signal, and each operative to produce the RF output signal at the output wherein at least one of the selectively activated amplifier elements is operatively responsive to the corresponding device configuration signal to operate in at least one of the first power output level and the second power output level, to vary a power output level of the scalable power amplifier;
a variable impedance circuit also coupled to the output of the scalable power amplifier and operatively responsive to the variable load impedance signal received from the device configuration circuit to provide a first impedance load at the output of the scalable power amplifier corresponding to the first power output level, and a second impedance load at the output of the scalable power amplifier corresponding to the second power output level. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A power amplifier circuit operative to receive an RF input signal and to produce an RF output signal comprising:
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a device configuration circuit operatively responsive to power output level data to provide a device configuration signal and a variable load impedance signal associated with a first and second power output level;
a scalable power amplifier having an output, and a plurality of selectively activated amplifier elements, each operative to receive the RF input signal via a corresponding RF input switch, and each selectively activated amplifier element is operative to produce the RF output signal at the output of the scalable power amplifier, wherein at least one of the plurality of selectively activated amplifier elements is operatively responsive to the device configuration signal associated with the first power output level to receive the RF input signal from the corresponding RF input switch, wherein at least one of the plurality of selectively activated amplifier elements is operatively responsive to the device configuration signal associated with the second power output level to receive the RF input signal having a reduced amplitude from the corresponding RF input switch; and
a variable impedance circuit coupled to the output of the scalable power amplifier and operatively responsive to the variable load impedance signal to provide a first impedance load at the output of the scalable power amplifier associated with the first power output level, and a second impedance load at the output of the scalable power amplifier associated with the second power output level. - View Dependent Claims (13, 14)
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15. A wireless device comprising:
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a processing circuit operative to produce power output level data;
a scalable power amplifier including an output, and a plurality of selectively activated amplifier elements each operative to produce an RF output signal at the output, and operative to dynamically vary a power output level in response to the power output level data;
a variable impedance circuit coupled to the output of the scalable power amplifier, and operatively responsive to the power output level data to vary an impedance of the variable impedance circuit to dynamically load the output of the scalable power amplifier; and
an antenna operatively coupled to the output of the scalable power amplifier and operative to transmit the RF output signal. - View Dependent Claims (16, 17)
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18. An amplification method comprising:
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selectively activating at least one selectively activated amplifier element within a scalable power amplifier including an output to vary a power output level of the scalable power amplifier; and
varying an impedance of a variable impedance circuit coupled to the output to dynamically load the scalable power amplifier by varying the impedance of the variable impedance circuit. - View Dependent Claims (19, 20, 21, 22)
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Specification