Envelope tracking voltage tracker circuit and related power management circuit
First Claim
1. An envelope tracking (ET) voltage tracker circuit comprising:
- amplifier circuitry comprising a voltage output and configured to;
operate based on an ET target voltage and a bias current to generate an ET modulated voltage at the voltage output for amplifying a radio frequency (RF) signal; and
cause an alternating current to flow through the voltage output in response to the RF signal being modulated above a defined modulation bandwidth; and
a bias modulation circuit configured to;
determine whether a level of the alternating current is between an upper current threshold and a lower current threshold lower than the upper current threshold, wherein the upper current threshold and the lower current threshold are configured to indicate whether the alternating current is approaching a defined current cross over point in between the upper current threshold and the lower current threshold; and
increase the bias current in response to the level of the alternating current being between the upper current threshold and the lower current threshold.
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Accused Products
Abstract
An envelope tracking (ET) voltage tracker circuit and related power management circuit are provided. In examples discussed herein, an amplifier circuit(s) is configured to amplify a radio frequency (RF) signal(s) based on an ET modulated voltage provided by an ET voltage tracker circuit(s). The ET voltage tracker circuit(s) includes amplifier circuitry, which operates based on an ET target voltage and a bias current to generate the ET modulated voltage. However, the ET modulated voltage may deviate from the ET target voltage from time to time due to cross over distortions. In this regard, the ET voltage tracker circuit includes a bias modulation circuit to dynamically determine the cross over distortion and adjust the bias current to reduce deviations of the ET modulated voltage. As a result, the ET modulated voltage can track the ET target voltage more closely, thus helping to improve linearity performance and efficiency of the amplifier circuit(s).
87 Citations
20 Claims
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1. An envelope tracking (ET) voltage tracker circuit comprising:
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amplifier circuitry comprising a voltage output and configured to; operate based on an ET target voltage and a bias current to generate an ET modulated voltage at the voltage output for amplifying a radio frequency (RF) signal; and cause an alternating current to flow through the voltage output in response to the RF signal being modulated above a defined modulation bandwidth; and a bias modulation circuit configured to; determine whether a level of the alternating current is between an upper current threshold and a lower current threshold lower than the upper current threshold, wherein the upper current threshold and the lower current threshold are configured to indicate whether the alternating current is approaching a defined current cross over point in between the upper current threshold and the lower current threshold; and increase the bias current in response to the level of the alternating current being between the upper current threshold and the lower current threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An envelope tracking (ET) power management circuit comprising a plurality of ET voltage tracker circuits, each of the plurality of ET voltage tracker circuits comprising:
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amplifier circuitry comprising a voltage output and configured to; operate based on a ET target voltage and a bias current to generate an ET modulated voltage at the voltage output for amplifying a radio frequency (RF) signal; and cause an alternating current to flow through the voltage output in response to the RF signal being modulated above a defined modulation bandwidth; and a bias modulation circuit configured to; determine whether a level of the alternating current is between an upper current threshold and a lower current threshold lower than the upper current threshold, wherein the upper current threshold and the lower current threshold are configured to indicate whether the alternating current is approaching a defined current cross over point in between the upper current threshold and the lower current threshold; and increase the bias current in response to the level of the alternating current being between the upper current threshold and the lower current threshold. - View Dependent Claims (17, 18, 19, 20)
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Specification