Transitioning from envelope tracking to average power tracking
First Claim
1. Circuitry comprising:
- an offset capacitive element coupled between a switching output and an analog output; and
an envelope tracking power supply having the switching output and the analog output, and configured to;
operate in one of an envelope tracking mode, a transition mode, and an average power tracking mode;
during the envelope tracking mode, provide an envelope power supply signal using the switching output and the analog output, wherein the envelope power supply signal at least partially envelope tracks an RF transmit signal;
during the transition mode, drive a voltage across the offset capacitive element from a first voltage to a second voltage; and
during the average power tracking mode, provide the envelope power supply signal, which is about equal to the second voltage, wherein;
during a transition from the envelope tracking mode to the transition mode, the offset capacitive element has the first voltage; and
during a transition from the transition mode to the average power tracking mode, the offset capacitive element has the second voltage.
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Accused Products
Abstract
An envelope tracking power supply and an offset capacitive element are disclosed. The offset capacitive element is coupled between a switching output and an analog output of the envelope tracking power supply, which operates in one of an envelope tracking mode, a transition mode, and an average power tracking mode. During the envelope tracking mode, the envelope tracking power supply provides an envelope power supply signal using both the switching output and the analog output. During the transition mode, the envelope tracking power supply drives a voltage across the offset capacitive element from a first voltage to a second voltage, such that during a transition from the envelope tracking mode to the transition mode, the offset capacitive element has the first voltage, and during a transition from the transition mode to the average power tracking mode, the offset capacitive element has the second voltage.
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Citations
28 Claims
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1. Circuitry comprising:
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an offset capacitive element coupled between a switching output and an analog output; and an envelope tracking power supply having the switching output and the analog output, and configured to; operate in one of an envelope tracking mode, a transition mode, and an average power tracking mode; during the envelope tracking mode, provide an envelope power supply signal using the switching output and the analog output, wherein the envelope power supply signal at least partially envelope tracks an RF transmit signal; during the transition mode, drive a voltage across the offset capacitive element from a first voltage to a second voltage; and during the average power tracking mode, provide the envelope power supply signal, which is about equal to the second voltage, wherein; during a transition from the envelope tracking mode to the transition mode, the offset capacitive element has the first voltage; and during a transition from the transition mode to the average power tracking mode, the offset capacitive element has the second voltage. - 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, 24, 25, 26, 27)
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28. A method comprising:
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providing an offset capacitive element coupled between a switching output and an analog output; and operating in one of an envelope tracking mode, a transition mode, and an average power tracking mode; during the envelope tracking mode, providing an envelope power supply signal using the switching output and the analog output, wherein the envelope power supply signal at least partially envelope tracks an RF transmit signal; during the transition mode, driving a voltage across the offset capacitive element from a first voltage to a second voltage; and during the average power tracking mode, providing the envelope power supply signal, which is about equal to the second voltage, wherein during a transition from the envelope tracking mode to the transition mode, the offset capacitive element has the first voltage; and during a transition from the transition mode to the average power tracking mode, the offset capacitive element has the second voltage.
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Specification