一种补偿量可调的反射式预失真线性化器

Design and Evaluation of Modified Reflective Predistortion Linearizer with Tunable Compensation

提出一种改进的反射式预失真电路,使其在相同功率区间上具有在线的补偿量调节能力。该电路对肖特基二极管不施加偏置电压,避免了因偏压改变而引起的补偿区间变化;在非线性产生电路中串联变容二极管,通过调节变容管的偏置电压,实现预失真器补偿量的调节。采用该方案设计加工了工作于29~31 GHz频段的反射式预失真器,实测结果表明:将变容管偏置电压由0调节至6 V,在相同功率区间内,该预失真器的增益扩张由4.5增大至7.6 d B,相位扩张由3.4°增大至51.1°。

We reported the design and evaluation of a modified reflective pre-distortion linearizer with tunable compensation within the same power compensation interval for microwave power amplifier. The original work included adoption of a varactor-diode in the nonlinear generation circuit and removal of the troublesome bias voltage on Schottky diode,because it negatively affects the compensation interval. The pre-distortion compensation could be easily realized by changing the bias of the varactor-diode. The prototyped,modified reflective pre-distortion linearizer,designed to operate in 29 ~ 31 GHz range,was simulated and measured. The simulated test results show that it works pretty well. To be specific,in the same power range,as the bias voltage applied on the varactor-diode increased from 0 to 6 V,the gain expansion changed from 4. 5 to 7. 6 d B and the phase expansion varied from 3. 4° to 51.1°.