【摘要】 为分析电荷泵中不同频率单粒子瞬变(SET)电流对锁相环(PLL)的影响,采用频域分析法从增益和带宽的角度研究了环路参数与SET响应的关系。分析结果表明,减小环路滤波电阻可以降低系统增益,从而有效降低压控振荡器控制电压的扰动;增大固有频率或阻尼因子则可以提高系统带宽,从而滤除更大范围的SET电流,同时还可以降低PLL恢复到锁定状态的时间。因此,减小环路滤波电阻、增大固有频率或阻尼因子是有效的设计加固方法。通过1GHz PLL的SET模拟验证了上述结论。更多还原

【Abstract】 Towards single-event transients(SETs) in charge pumps(CPs) for phase-locked loops(PLLs),the effects brought about by different frequency SETs induced currents are analyzed.Based on frequency domain analyses,the relation between loop parameters and SET response is investigated with respect to gain and bandwidth.The results reveal that decreasing the loop filter resistance to decrease the gain can significantly mitigate the SET induced voltage perturbation of the voltage-controlled oscillator’s(VCO) control voltage,and that increasing the damping ratio or the nature frequency to increase the bandwidth can filter out more SET currents in a wider frequency range and effectively reduce the PLL recovery time.Therefore,decreasing the loop filter resistance,increasing the damping ratio or the nature frequency are effective radiation-hardened-by-design techniques.Eventually,the conclusions are validated by transistor-level simulations for a 1GHz PLL.更多还原