宽带发射组件相位线性度改善技术研究

宽带雷达系统对发射通道的相位线性度的要求越来越高,而组件的发射通道往往工作在深饱和状态,幅度和相位都出现非线性压缩。介绍了一种可有效改善组件相位非线性度的设计方法,通过对已有功率芯片进行非线性建模,利用软件负载牵引法找出功放单片的最佳线性相位点,并针对此点进行二次匹配。将设计结果应用于实际产品,测试结果验证了使用此设计方法可有效改善宽带T/R组件相位非线性度。

基于WMQPSO算法的慢波结构优化设计

本文首次将带惯性权重的多目标量子粒子群(WMQPSO)算法应用到空间行波管慢波结构优化中。仅以提高电子效率为目标优化时,电子效率提高了6%,但非线性相移变大;以提高电子效率和减小非线性失真为目标时,电子效率提高了约3%,同时非线性相移降低了15°。实验结果表明,联合优化有效地改善了电子效率和非线性相位失真,优化结果显著。

High-Consistency Behavior Modeling of a Switched-Capacitor Sigma-Delta Modulator in SIMULINK

To improve the simulation accuracy of SIMULINK, a novel inclusive behavior model of an integrator is proposed that introduces the effects of different circuit nonidealities of a switched-capacitor sigma-delta modulator into SIMULIK simulation. The nonlinear DC gain and nonlinear settling process are introduced into the op-amp module. The signaldependent charge injection and nonlinear resistance are introduced into the switch module. In addition, the noise source including flicker and thermal noise is introduced into system as an independent module. The novel model is verified by SIMULINK behavioral simulations. The results are compared with results from circuit level simulation in Cadence SPICE using TSMC 0.35μm mixed signal technology. It shows that the novel model succeeds in introducing the influences of the nonidealities into behavior simulation to more realistically describe the circuit performances and increase the accuracy of SIMULINK simulation.