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基于CMOS体驱动,提出低电压基准电流源电路抗干扰设计,提高航管一次雷达射频前端接收电路的可靠性。电路采用体驱动技术实现低电源电压工作,采用敏感隔离结构提高电流镜电路抗干扰性能。设计采用电源电压为1 V的0.35μm标准CMOS工艺,对该基准电流源电路的抗电磁干扰特性进行理论分析与仿真验证,并同普通体驱动结构相比较。实验结果表明:当输入端存在3倍于参考电流大小的电磁干扰时,该结构的电流偏移小于0.3μA。
Based on CMOS body driving, the anti-interference design of low-voltage reference current source circuit is put forward to improve the reliability of first-line RF front-end receiving circuit. The circuit uses body-driven technology to achieve low power supply voltage, and the sensitive isolation structure improves the anti-interference performance of the current mirror circuit. The 0.35μm standard CMOS process with 1 V supply voltage is designed to theoretically analyze and simulate the anti-EMI performance of the reference current source circuit, and compared with the common body driving structure. The experimental results show that the current offset of the structure is less than 0.3μA when there is three times of electromagnetic interference at the input of the reference current.