低雑音・低揺らぎ基準電圧発生回路

抄録

This paper presents a trial of constituting a DC reference voltage circuit which has general purpose feasibilities. The circuit pursuing a high quality on both the exactness and the preciseness is composed of a zener diode parallely connected by a Lithium storage battery. The fundamental idea is to suppress the noise and fluctuation components inherently inevitable in the zener diode to as low a level as possible by using the battery as a capacitor having a large capacity, since the Lithium battery is of quite low noise. Then the key point is dependent on the exactness and the stability of the temperature control of the circuit. The circuit having the reference voltage 3.2[V] is produced by way of trial and the characteristics are as follows: (i) The temperature dependence is 1.43[μV/°C] (=0.45[ppm/°C]); (ii) The amplitude of the fluctuation frequency components lower than l[Hz] is less than ±0.75[μV] and (iii) The noise components over the frequency range from l[Hz] to 2[MHz] is less than 0.9[μV] (rms). The fluctuation level arrives at the order of -130[dB] and there can never be found a voltage reference device having such a quality regarding the pursuit of the general purpose utilities.