发明名称 |
High-Efficiency Envelope Tracking Systems and Methods for Radio Frequency Power Amplifiers |
摘要 |
High-efficiency envelope tracking (ET) methods and apparatus for dynamically controlling power supplied to radio frequency power amplifiers (RFPAs). An exemplary ET circuit includes a switch-mode converter coupled in parallel with a split-path linear regulator. The switch-mode converter is configured to generally track an input envelope signal Venv and supply the current needs of a load (e.g., an RFPA). The split-path linear regulator compensates for inaccurate envelope tracking by sourcing or sinking current to the load via a main current path. A current sense path connected in parallel with the main current path includes a current sense resistor used by a hysteresis comparator to control the switching of the switch-mode converter. The split-path linear regulator is configured so that current flowing in the current sense path is a lower, scaled version of the current flowing in the main current path.
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申请公布号 |
US2009289720(A1) |
申请公布日期 |
2009.11.26 |
申请号 |
US20080126475 |
申请日期 |
2008.05.23 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TAKINAMI KOJI;LIANG PAUL CHENG-PO |
分类号 |
H03F3/04;G05F1/46 |
主分类号 |
H03F3/04 |
代理机构 |
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主权项 |
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地址 |
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