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一、引言在前多应用晶体管作为低电平开关的地方,如模拟—数字转换器、多路系统及用振子的直流放大器等等,晶体管开关的精度及速度两者都很重要。基极电压驱动开关有极快的开关速度,但是电压暂态波动大并且直流稳定性较差(除非严格控制基极驱动电压及晶体管温度);另一方面,基极电流驱动开关有良好的直流特性,但暂态响应慢。假如用共集线路(如图1的开关线路所示),接通时的固
I. INTRODUCTION In the past where multi-application transistors were used as low-level switches, such as analog-to-digital converters, multiplexed systems, and DC amplifiers with transducers, the accuracy and speed of transistor switching are both important. The base voltage drive switch has a very fast switching speed, but the voltage transient is large and the DC stability is poor (unless the base drive voltage and transistor temperature are tightly controlled); on the other hand, the base current drive switch has good dc Characteristics, but the transient response is slow. If you use a total set of lines (as shown in the switching circuit of Figure 1), when connected to the solid