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在基准电压源和稳压器中,目前很多采用稳压值为6V 左右的温度补偿稳压二极管2DW230～2DW236,以提高输出电压的稳定性。但是在构成低压设备时,就显得不方便,同时这些稳压管的稳定电流必须选择在接近10mA,消耗功率较大,在应用电池供电时,就限制了它的应用。图1介绍一种高稳定度低压基准电压源。该电路利用晶体管 BG_(23)发射结电压 U_(be23)与电阻 R_2上的压降 U_(R2)的温度变化具有相反的特性来保证输出电压的高稳定性。输出电压 U_0为 U_(be23)+U_(R2),U_(R2)为I_(C22)R_2,式中 I_(c22)约为(U_(be21)-U_(be22)/R_3,而晶体管 pn结的伏安特性为
In the reference voltage regulator and voltage regulator, many current use of the voltage regulator is about 6V temperature compensation diode 2DW230 ~ 2DW236, in order to improve the stability of the output voltage. However, in the composition of low-voltage equipment, it becomes inconvenient, while the regulator of the steady current must be selected at close to 10mA, consume more power in the application of battery-powered, it limits its application. Figure 1 shows a high stability low voltage reference. The circuit uses the transistor BG_ (23) emitter junction voltage U_ (be23) and the resistance R_2 pressure drop U_ (R2) temperature changes have the opposite characteristics to ensure high output voltage stability. The output voltage U_0 is U_ (be23) + U_ (R2) and U_ (R2) is I_ (C22) R_2, where I_ (c22) is about (be_21) -U_ (be22) / R_3, and the transistor pn junction The volt-ampere characteristic is