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专利名称：High-efficiency modulating RF amplifier发明人：Earl W. McCune申请号：US11317228申请日：20051222公开号：US07395038B2公开日：20080701
专利附图：
摘要：The present invention, generally speaking, provides for high-efficiency powercontrol of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such amanner as to achieve a desired modulation. In one embodiment, the spread between amaximum frequency of the desired modulation and the operating frequency of a switch-
mode DC-DC converter is reduced by following the switch-mode converter with an activelinear regulator. The linear regulator is designed so as to control the operating voltageof the power amplifier with sufficient bandwidth to faithfully reproduce the desiredamplitude modulation wave-form. The linear regulator is further designed to rejectvariations on its input voltage even while the output voltage is changed in response to anapplied control signal. This rejection will occur even though the variations on the inputvoltage are of commensurate or even lower frequency than that of the controlledoutput variation. Amplitude modulation may be achieved by directly or effectively varyingthe operating voltage on the power amplifier while simultaneously achieving highefficiency in the conversion of primary DC power to the amplitude modulated outputsignal. High efficiency is enhanced by allowing the switch-mode DC-to-DC converter toalso vary its output voltage such that the voltage drop across the linear regulator is keptat a low and relatively constant level. Time-division multiple access (TDMA) burstingcapability may be combined with efficient amplitude modulation, with control of thesefunctions being combined. In addition, the variation of average output power level inaccordance with commands from a communications system may also be combined withinthe same structure.
申请人：Earl W. McCune
地址：Santa Clara CA US
国籍：US
代理机构：McDermott Will & Emery LLP
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