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41. 发明申请

WO2003073603A2 CURRENT MODULATOR WITH DYNAMIC AMPLIFIER IMPEDANCE COMPENSATION 审中-公开
标题翻译：具有动态放大器阻抗补偿的电流调制器
公开(公告)号：WO2003073603A2
公开(公告)日：2003-09-04
申请号：PCT/US2003/001766
申请日：2003-01-21
申请人： ERICSSON INC. , CAMP, William , HADJICHRISTOS, Aristotele , PEHLKE, David
发明人： CAMP, William , HADJICHRISTOS, Aristotele , PEHLKE, David
IPC分类号： H03F
CPC分类号： H03G3/3047 , H03F1/0233 , H03F1/0272 , H03F1/56 , H03F2200/504 , H03G3/004 , H03G3/3042
摘要： An amplitude modulation circuit provides modulated supply current, possibly in combination with modulated supply voltage, to a radio frequency power amplifier, and includes a detection circuit responsive to changes in the ratio of that voltage to the modulated supply current, described herein as its AM modulation impedance. Such impedance (resistance) changes commonly arise from changing coupling characteristics at the antenna assembly driven by the power amplifier. A gain control circuit may be associated with the detection circuit, and made responsive thereto, thus allowing adjustment of modulation gain control responsive to changes in AM modulation impedance. That arrangement permits the modulator to hold a fixed modulation gain over changing AM modulation impedance, while other embodiments vary modulation gain responsive to power amplifier impedance changes to avoid signal clipping that might otherwise occur where increased power amplifier resistance would result in voltages exceeding the supply voltage of the power amplifier.
摘要翻译：幅度调制电路将调制的电源电流（可能与调制的电源电压组合）提供给射频功率放大器，并且包括响应于该电压与调制电源电流的比率变化的检测电路，这里描述为其AM调制阻抗。这种阻抗电阻的改变通常是由功率放大器驱动的天线组件上的耦合特性的变化引起的。增益控制电路可以与检测电路相关联，并且对其进行响应，从而允许响应于AM调制阻抗的变化来调整调制增益控制。这种布置允许调制器在改变AM调制阻抗的情况下保持固定的调制增益，而其他实施例响应于功率放大器阻抗变化来改变调制增益，以避免在功率放大器电阻增加导致电压超过电源电压的情况下可能发生的信号限幅的功率放大器。

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