CV and EIS tests show that two redox couples of Ni2+/ Ni3+ and Co3+/ Co4+ are observed in the potential range of 2.80~ 4.80 V, and charge transfer resistance of the cathode decreases as the charge cutoff voltage increased. 循环伏安测试表明:在2.80~4.80V扫描范围内,该正极材料发生Ni2+/Ni3+,Co3+/Co4+两对电化学反应。EIS测试表明:随着充电截止电压的增大,该正极材料的传荷电阻变小。
Cutoff frequency, such constraint conditions, are set with device's current allowance and voltage stress considered. 截止角频率等约束条件的选择充分考虑到器件的电流负担和电压应力;
The digital-assisted frequency tuning scheme can remain the cutoff frequency constant with the variation of process, voltage and temperature. 数字辅助的频率校准电路能够使滤波器的截止频率保持恒定,覆盖了芯片由于工艺、电压、温度变化而造成的频率偏差。