DEVICE AND METHOD FOR CONTROLLING POWER AMPLIFIER
First Claim
1. A device for controlling operation of a power amplifier configured to amplify an input signal, the device comprising:
- a detector configured to detect a negative peak voltage level of an output signal of the power amplifier with respect to a predetermined boost threshold and to generate a corresponding detection signal and a reference signal; and
a controller configured to provide a supply voltage to an output transistor of the power amplifier based on a comparison of the detection signal and the reference signal, the supply voltage being a no boost voltage, which is substantially the same as a supply voltage, when the comparison indicates that the negative peak voltage level is within the predetermined boost threshold, and the supply voltage being one of a plurality of boost voltages when the detection signal indicates that the negative peak voltage level is beyond the predetermined boost threshold,wherein the controller generates the plurality of boost voltages by boosting the supply voltage.
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Accused Products
Abstract
A device for controlling operation of a power amplifier includes a detector, a reference signal generator and a controller. The detector is configured to detect a voltage level of an output signal of the power amplifier with respect to a predetermined boost threshold and to generate a corresponding detection signal and a reference signal. The controller is configured to provide a supply voltage to an output transistor of the power amplifier based on a comparison of the detection signal and the reference signal, the supply voltage being a no boost voltage, which is substantially the same as a supply voltage, when the comparison indicates that the voltage level is within the predetermined boost threshold, and the supply voltage being one of multiple boost voltages when the detection signal indicates that the voltage level is beyond the predetermined boost threshold. The controller generates the boost voltages by boosting the supply voltage.
23 Citations
17 Claims
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1. A device for controlling operation of a power amplifier configured to amplify an input signal, the device comprising:
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a detector configured to detect a negative peak voltage level of an output signal of the power amplifier with respect to a predetermined boost threshold and to generate a corresponding detection signal and a reference signal; and a controller configured to provide a supply voltage to an output transistor of the power amplifier based on a comparison of the detection signal and the reference signal, the supply voltage being a no boost voltage, which is substantially the same as a supply voltage, when the comparison indicates that the negative peak voltage level is within the predetermined boost threshold, and the supply voltage being one of a plurality of boost voltages when the detection signal indicates that the negative peak voltage level is beyond the predetermined boost threshold, wherein the controller generates the plurality of boost voltages by boosting the supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of selectively boosting a collector supply voltage of an output transistor in a power amplifier amplifying a radio frequency (RF) signal, the method comprising:
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providing a supply voltage as the collector supply voltage of the output transistor by connecting a supply voltage source to the output transistor, and selectively connecting a plurality of charge storage capacitors to receive charge from the supply voltage source to charge each of the plurality of charge storage capacitors to a capacitor voltage value; evaluating a magnitude of an envelope of the RF signal and detecting when a lowest occurring voltage extreme of the envelope becomes less than a predetermined boost threshold; providing a first boosted voltage as the collector supply voltage when the lowest occurring voltage extreme of the envelope becomes less than the predetermined boost threshold by connecting one of the plurality of charge storage capacitors between the supply voltage source and the output transistor, the first boosted voltage comprising the supply voltage plus the capacitor voltage value previously stored in one of the plurality of charge storage capacitors; and providing a second boosted voltage as the collector supply voltage when the lowest occurring voltage extreme of the envelope becomes less than the predetermined boost threshold, while the first boosted voltage is being provided as the collector supply voltage, by simultaneously connecting two of the plurality of charge storage capacitors between the supply voltage source and the output transistor, the second boosted voltage comprising the supply voltage plus the capacitor voltage values previously stored in both of the two charge storage capacitors. - View Dependent Claims (14, 15)
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16. A device for controlling operation of a power amplifier configured to amplify a radio frequency (RF) signal, the device comprising:
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a detector configured to generate a detection signal and a reference signal based on a negative peak voltage level of an output signal of the power amplifier; a DC controller configured to provide a DC supply voltage and a plurality of compensation signals to an output transistor of the power amplifier based on comparison of the detection signal and the reference signal, the DC supply voltage being a no boost voltage when the negative peak voltage level is above a predetermined boost threshold, and one of a medium boost voltage and a high boost voltage when the negative peak voltage level is below the predetermined boost threshold; and a compensation circuit comprising a plurality of series RC circuits connected in series with a corresponding plurality of switches for selectively connecting one or more of the plurality of series RC circuits, respectively, around the transistor in a shunt-shunt feedback configuration in response to the plurality of compensation signals. - View Dependent Claims (17)
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Specification