Envelope tracking circuit and related power amplifier system
First Claim
1. An envelope tracking (ET) circuit comprising:
- an ET voltage circuit comprising;
a first number of tracker circuits configured to generate a first number of ET modulated voltages;
a second number of voltage inputs configured to receive a second number of target voltages, wherein the second number of voltage inputs does not equal the first number of tracker circuits; and
a third number of voltage outputs configured to output the first number of ET modulated voltages; and
a control circuit configured to;
couple a selected number of tracker circuits among the first number of tracker circuits to a selected number of voltage inputs among the second number of voltage inputs, wherein the selected number of tracker circuits is configured to;
receive a selected number of target voltages among the second number of target voltages via the selected number of voltage inputs; and
generate a selected number of ET modulated voltages among the first number of ET modulated voltages based on the selected number of target voltages; and
selectively provide the selected number of ET modulated voltages to the third number of voltage outputs.
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Accused Products
Abstract
Envelope tracking circuit and related power amplifier system are provided. In one aspect, an ET circuit is configured to generate a first number of ET modulated voltages based on a second number of target voltages and output the first number of ET modulated voltages via a third number of voltage outputs. In another aspect, the ET circuit can be provided in a power amplifier system including a transceiver circuit(s) and a number of power amplifier circuits. In examples discussed herein, the ET circuit may receive the second number of target voltages from the transceiver circuit(s) and provide the first number of ET modulated voltages to the power amplifier circuits for amplifying a radio frequency (RF) signal(s). By providing the ET circuit in the power amplifier system, it is possible to flexibly enable ET power management based on any number of transceiver circuits and for any number of power amplifier circuits.
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Citations
25 Claims
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1. An envelope tracking (ET) circuit comprising:
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an ET voltage circuit comprising; a first number of tracker circuits configured to generate a first number of ET modulated voltages; a second number of voltage inputs configured to receive a second number of target voltages, wherein the second number of voltage inputs does not equal the first number of tracker circuits; and a third number of voltage outputs configured to output the first number of ET modulated voltages; and a control circuit configured to; couple a selected number of tracker circuits among the first number of tracker circuits to a selected number of voltage inputs among the second number of voltage inputs, wherein the selected number of tracker circuits is configured to; receive a selected number of target voltages among the second number of target voltages via the selected number of voltage inputs; and generate a selected number of ET modulated voltages among the first number of ET modulated voltages based on the selected number of target voltages; and selectively provide the selected number of ET modulated voltages to the third number of voltage outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power amplifier system comprising:
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an envelope tracking (ET) circuit comprising; an ET voltage circuit comprising; a first number of tracker circuits configured to generate a first number of ET modulated voltages; a second number of voltage inputs configured to receive a second number of target voltages, wherein the second number of voltage inputs does not equal the first number of tracker circuits; and a third number of voltage outputs configured to output the first number of ET modulated voltages; and a control circuit configured to; couple a selected number of tracker circuits among the first number of tracker circuits to a selected number of voltage inputs among the second number of voltage inputs, wherein the selected number of tracker circuits is configured to; receive a selected number of target voltages among the second number of target voltages via the selected number of voltage inputs; and generate a selected number of ET modulated voltages among the first number of ET modulated voltages based on the selected number of target voltages; and selectively provide the selected number of ET modulated voltages to the third number of voltage outputs; and a plurality of power amplifier circuits coupled to the third number of voltage outputs each configured to amplify a radio frequency (RF) signal based on an ET modulated voltage among the first number of ET modulated voltages. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification