Design method of reflective broadband predistorter for solid-state power amplifier
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摘要: 提出了一种特定增益和相位补偿的反射式宽带线性化器设计方法，并通过此方法设计了一种补偿固态功率放大器失真特性的预失真电路。利用肖特基二极管产生非线性补偿，根据电路拓扑结构，利用matlab优化工具找到单频点处特定增益补偿和相位补偿特性的并联负载值，改变频点，并重复上述步骤，可进一步得到特定增益和相位补偿所需的并联负载随频率的变化关系（即ZL～f曲线）。利用ADS仿真软件优化设计使二极管后端阻抗随频率的变化逼近ZL-f曲线。仿真的电路增益补偿和相位补偿分别为6 dB和−40°。最终实测频率范围为9.4～11.4 GHz，增益扩张在3.9～4.4 dB，相位补偿在−32.3°～−41.5°，频带特性良好，并且相对带宽达到了19.2%。通过改变二极管直流偏置电压，还实现了补偿曲线的斜率可调。Abstract: A design method for broadband reflective linearizer with specific gain and phase compensation is proposed, and a predistortion linearizer for solid-state power amplifiers is designed by this method. Nonlinear compensation is produced using the Schottky diode. The MATLAB optimization tool is utilized to calculate the shunt load’s impedance at a single frequency point with the specified gain and phase compensation in accordance with the circuit topology. To obtain the variation of the shunt load with frequency necessary for a specific gain and phase compensation, i.e. the ZL-f curve, the frequency point is changed, and the aforementioned procedures are repeated. The circuit is optimized using the ADS software so that the change in impedance of the diode's parallel load with frequency is approximated by the ZL-f curve. The gain compensation and phase compensation of the circuit simulated in this paper are 6 dB and −40°, respectively. The final measurement reveals that the frequency band characteristics are good when the frequency range is 9.4–11.4 GHz, the gain expansion is 3.9–4.4 dB, and the phase compensation is −32.3°–41.5°. Additionally, the relative bandwidth of linearizer is 19.2%. By changing the DC bias voltage of the diode, the slope of the compensation curve is also adjustable.
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图 5 不同频率下预失真器的仿真补偿曲线
Figure 5. Simulation compensation curve of the predistorter at different frequencies
图 6 在10 GHz时不同偏置电压Vcc下预失真器仿真补偿曲线
Figure 6. Simulation compensation curve of predistorter under different Vcc biases at 10GHz
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