| 摘要 |
PURPOSE: A feed forward linear power amplifier is provided to stabilize a final output terminal by analyzing and controlling the second loop within a frequency region. CONSTITUTION: A feed forward linear power amplifier includes the first coupler(1) for separating an input signal, the first phase and amplitude converter(2) for controlling a phase and an amplitude, a main amplifier(3) for amplifying a signal, the second coupler(4) for separating the signal, the first time delay portion(5) for delaying the signal, a subtraction circuit(6) for synthesizing two signals, the second phase and amplitude converter(7) for controlling the phase and the amplitude, an error amplifier(8) for amplifying the signal, the second delay portion(9) for delaying the signal, and an addition circuit(10) for synthesizing the signals. The feed forward linear power amplifier further includes the third coupler(11), the fourth coupler(12), an analog spectrum circuit(13), and a digital control circuit(14). The third coupler(11) for separating an output signal from the subtraction circuit(6), the fourth coupler(12) for separating an output signal from the addition circuit(10), an analog spectrum circuit(13) for digitalizing the output signal of the fourth coupler(12), and a digital control circuit(14) for controlling the first and the second phase and amplitude converters(2,7).
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