High-level modulation method and apparatus
First Claim
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1. A system for amplitude-modulating a power amplifier comprising:
- a power supply regulator circuit configured to regulate a direct current (DC) supply to the power amplifier in response to a control input signal;
a current sense circuit configured to sense a current of the DC supply to the power amplifier to provide a sensed current signal;
a voltage sense circuit configured to sense a voltage of the DC supply to the power amplifier to provide a sensed voltage signal;
a power supply control circuit configured to receive an amplitude input signal corresponding to an amplitude modulated waveform, the sensed current signal and the sensed voltage signal and provide the control input signal to the power supply regulator circuit based on the amplitude input signal, the sensed current signal and the sensed voltage signal.
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Abstract
Methods and systems for amplitude-modulating a power amplifier based on sensed current and sensed voltage provided to the power amplifier are provided. The sensed current and sensed voltage may be summed to provided both current and voltage feedback to modulate the power supplied to the power amplifier. Alternatively, both the current feedback and the voltage feedback may be selectively utilized to modulate the power supplied to the power amplifier.
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Citations
53 Claims
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1. A system for amplitude-modulating a power amplifier comprising:
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a power supply regulator circuit configured to regulate a direct current (DC) supply to the power amplifier in response to a control input signal;
a current sense circuit configured to sense a current of the DC supply to the power amplifier to provide a sensed current signal;
a voltage sense circuit configured to sense a voltage of the DC supply to the power amplifier to provide a sensed voltage signal;
a power supply control circuit configured to receive an amplitude input signal corresponding to an amplitude modulated waveform, the sensed current signal and the sensed voltage signal and provide the control input signal to the power supply regulator circuit based on the amplitude input signal, the sensed current signal and the sensed voltage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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24. A circuit for amplitude-modulation of a power amplifier of a transmitter of a wireless device, comprising:
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an amplitude modulation signal generator that generates an amplitude modulation signal with a desired waveform;
a regulator circuit that regulates a direct current (DC) supply to the transmitter power amplifier in response to a control input signal;
a voltage sensor that senses the voltage of the regulated DC supply to provide a voltage feedback signal;
a current sensor that senses the current drawn by the transmitter power amplifier from the regulated DC supply to provide a current feedback signal;
a comparator that compares the voltage feedback signal and the current feedback signal with the amplitude modulation signal to provide the control input signal.
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44. A method for amplitude modulating a power amplifier, comprising:
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sensing a current provided to the power amplifier to provide a sensed current value;
sensing a voltage provided to the power amplifier to provide a sensed voltage value;
receiving an input signal corresponding to an amplitude modulated waveform;
combining the sensed current value and the sensed voltage value to provide a combined value; and
controlling a direct current (DC) power supply which supplies power to the power amplifier based on the combined value and the amplitude modulated waveform. - View Dependent Claims (45, 46, 47, 48, 49)
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50. A method for amplitude modulating a power amplifier of a transmitter, comprising:
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modulating a current drawn by the power amplifier when a ratio of the current drawn to a supply voltage provided to the power amplifier is greater than a predetermined ratio, and modulating the supply voltage provided to the power amplifier when the ratio of current drawn to the supply voltage is less than the predetermined ratio. - View Dependent Claims (51)
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52. A system for amplitude modulating a power amplifier, comprising:
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means for sensing a current provided to the power amplifier to provide a sensed current value;
means for sensing a voltage provided to the power amplifier to provide a sensed voltage value;
means for receiving an input signal corresponding to an amplitude modulated waveform;
means for combining the sensed current value and the sensed voltage value to provide a combined value; and
means for controlling a direct current (DC) power supply which supplies power to the power amplifier based on the combined value and the amplitude modulated waveform.
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53. A system for amplitude modulating a power amplifier of a transmitter, comprising:
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means for modulating a current drawn by the power amplifier when a ratio of the current drawn to a supply voltage provided to the power amplifier is greater than a predetermined ratio, and means for modulating the supply voltage provided to the power amplifier when the ratio of current drawn to the supply voltage is less than the predetermined ratio.
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Specification