Power amplifier efficiency using error estimate and data rate
First Claim
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1. An apparatus for wirelessly transmitting data, comprising:
- a source of data to produce an input signal having an associated data rate;
a variable bias circuit to generate a bias voltage;
a power amplifier connected to the source and the variable bias circuit to amplify the input signal based on the bias voltage to produce an output signal;
a power detector to generate a power measure of the output signal; and
a processor connected to the power detector and the variable bias circuit to selectively control the variable bias circuit to lower the bias voltage based on the power measure and the data rate of the input signal, wherein the processor is arranged to estimate a transmission error measure from the power measure and wherein the processor is further arranged to compare the transmission error measure with a maximum allowable error that is associated with the data rate of the input signal, and to control the variable bias circuit to lower the bias voltage if the transmission error measure is lower than the maximum allowable error.
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Abstract
A method of adjusting a power amplifier may include producing a power measure of an output signal of the power amplifier and estimating an estimated transmission error of the output signal from the power measure. The estimated transmission error may be compared with a maximum error that is associated with a data rate of the output signal. A bias voltage that is input to the power amplifier may be decreased if the comparing determines that the estimated transmission error is less than the maximum error.
18 Citations
17 Claims
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1. An apparatus for wirelessly transmitting data, comprising:
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a source of data to produce an input signal having an associated data rate; a variable bias circuit to generate a bias voltage; a power amplifier connected to the source and the variable bias circuit to amplify the input signal based on the bias voltage to produce an output signal; a power detector to generate a power measure of the output signal; and a processor connected to the power detector and the variable bias circuit to selectively control the variable bias circuit to lower the bias voltage based on the power measure and the data rate of the input signal, wherein the processor is arranged to estimate a transmission error measure from the power measure and wherein the processor is further arranged to compare the transmission error measure with a maximum allowable error that is associated with the data rate of the input signal, and to control the variable bias circuit to lower the bias voltage if the transmission error measure is lower than the maximum allowable error. - View Dependent Claims (2, 3, 4)
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5. A method of adjusting a power amplifier, comprising:
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producing a power measure of an output signal of the power amplifier; estimating an estimated transmission error of the output signal from the power measure; comparing the estimated transmission error with a maximum error that is associated with a data rate of the output signal; and decreasing a bias voltage input to the power amplifier if the comparing determines that the estimated transmission error is less than the maximum error. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of increasing efficiency of a power amplifier, comprising:
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measuring a peak to average power ratio of an output signal of the power amplifier; determining a data rate of the output signal; calculating an estimated error based on the peak to average power ratio; and adjusting a linearity of the power amplifier based on both the peak to average power ratio and the data rate. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification