公开(公告)号：WO2012109227A2

公开(公告)日：2012-08-16

申请号：PCT/US2012024124

申请日：2012-02-07

Applicant: RF MICRO DEVICES INC

Inventor： KHLAT NADIM ,  HORLANDER KARL F

IPC: H03F1/02

CPC classification number: H03F1/0227 ,  H03F3/24 ,  H03F2200/411 ,  H03F2200/447 ,  H03F2200/465

Abstract: An open loop envelope tracking system calibration technique and circuitry are proposed. A radio frequency power amplifier receives a modulated signal. An envelope tracker power converter generates a modulated power amplifier supply voltage for the radio frequency power amplifier based on a control signal derived from the modulated signal. A first output power and a second output power of the radio frequency power amplifier are measured when the control signal is respectively delayed by a first delay period and a second delay period. A sensitivity of the output power of the radio frequency power amplifier is near a maximum near the first delay period and the second delay period. The first delay period and/or the second delay period are adjusted until the first output power substantially equals the second output power. The first delay period and the second delay period are used to obtain a calibrated fine tuning delay offset.

Abstract translation: 提出了开环包络跟踪系统校准技术和电路。 射频功率放大器接收调制信号。 信封跟踪器功率转换器基于从调制信号导出的控制信号，为射频功率放大器生成调制功率放大器电源电压。 当控制信号分别延迟第一延迟周期和第二延迟周期时，测量射频功率放大器的第一输出功率和第二输出功率。 射频功率放大器的输出功率的灵敏度在第一延迟周期和第二延迟周期附近接近最大值。 第一延迟周期和/或第二延迟周期被调整直到第一输出功率基本上等于第二输出功率。 第一延迟周期和第二延迟周期用于获得经校准的微调延迟偏移。