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针对光电探测器的光电流信号弱、变化范围大的特点,设计了一种全新的检测光电流信号的跨阻放大器(TIA)电路结构,其检测电流信号范围为1.6μA~1.6mA,动态电流检测范围达到60dB。通过在电路内部设计出两个增益可调、增益段不同的TIA,分别处理光电流的小电流段(1.6~50μA)和大电流段(50μA~1.6mA),增益可调范围为56~96dBΩ;通过外置输出电压饱和检测信号,选择所需工作的TIA及其增益段。该电路采用0.18μm标准CMOS工艺的PDK进行电路设计、版图设计和仿真验证等。测试结果表明:在检测电流为1.6μA时,输出电压为95mV;检测电流为1.6mA时,输出电压为915mV,与仿真结果相一致。电路瞬态特性良好,上升时间为5~10ns,3.3V电压下功耗小于2mW,各指标满足设计要求。
Aiming at the characteristics of the photodetector’s weak and wide range of photocurrent signal, a novel transimpedance amplifier (TIA) circuit structure for detecting photocurrent signal is designed. The detection current signal range is 1.6μA ~ 1.6mA, the dynamic current Detection range of 60dB. By designing two TIA with adjustable gain and different gain sections in the circuit, the small current section (1.6 ~ 50μA) and the large current section (50μA ~ 1.6mA) of the photocurrent are respectively processed. The adjustable gain range is 56 ~ 96dBΩ ; Through the external output voltage saturation detection signal, select the work of TIA and its gain section. The circuit uses 0.18μm standard CMOS process PDK circuit design, layout design and simulation verification. The test results show that the output voltage is 95mV at the detection current of 1.6μA and the output voltage is 915mV at the detection current of 1.6mA, which is consistent with the simulation results. Good transient circuit performance, rise time of 5 ~ 10ns, 3.3V power consumption of less than 2mW, the indicators meet the design requirements.