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迄今为止,电路中使用的基准电压源主要由齐纳二极管来担任。但是一般齐纳二极管存在一些问题,第一是动态内阻大,一般均在十几欧姆以上,尤其在小电流下,内阻更大;因此稳压性能很不理想。第二是稳压值易受环境温度影响,温漂大。第三,一般齐纳二极管的击穿电压容易受硅片表面状态的影响,噪声性能很差。精密有源基准 NG199(参考美国国家半导体的LM199而设计的)则克服了齐纳二极管的上述缺点,具有一般齐纳二极管所不及的性能指标,其温漂可低于1ppm/℃。在电子线路中,凡使用稳压管的地方几乎都可用NG199代替,并且能使线路性能大大改善。在模数转换、精密电压源、精密电流源等方面都有广阔的应用前景。
So far, the reference used in the circuit is mainly served by the Zener diode. However, there are some problems with Zener diodes in general. The first one is that the internal resistance is large and generally more than a dozen ohms, especially under small current. Therefore, the internal resistance is not ideal. The second is the value of the voltage regulator vulnerable to environmental temperature, drift big. Third, the breakdown voltage of Zener diodes is generally affected by the state of the surface of the silicon, and the noise performance is poor. The precision active reference NG199 (referenced to National’s LM199) overcomes the above shortcomings of Zener diodes with performance below that of typical Zener diodes, with a temperature drift of less than 1 ppm / ° C. In the electronic circuit, where the use of voltage regulator tube can almost replace NG199, and can make the circuit performance greatly improved. In the analog-digital conversion, precision voltage source, precision current source and so has a broad application prospects.