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    • 27. 发明公开
    • Procedure for measuring the threshold voltage of a comparator and an application of this procedure
    • 测量比较器的阈值电压和应用该方法的方法
    • EP1024370A3
    • 2006-07-26
    • EP00101269.9
    • 2000-01-26
    • TEXAS INSTRUMENTS DEUTSCHLAND GMBH
    • Pinta, HeinrichHernitscheck, ChristianMayer, Jürgen
    • G01R31/30G01R35/00G01R19/165
    • G01R35/005G01R19/165
    • In a procedure for the measurement of the threshold voltage of a comparator, the output voltage of which is changing in a characteristic manner when its input voltage exceeds or falls below its threshold voltage, the following steps are involved:

      a) Application of a first known voltage U1 to a discharged capacitor connected to the input of the comparator by way of a first resistor, and measurement of the time duration N3 between the commencement of the thereby occurring charging process of the capacitor and the change in the output voltage of the comparator;
      b) further complete charging of the capacitor up to the known first voltage U1;
      c) discharge of the capacitor by way of a second resistor of the same resistive value as the first resistor, and measurement of the time duration N2 between the commencement of the discharging process and a change of the output voltage of the comparator;
      d) application of a second known voltage U2, different from the first voltage U1, to the capacitor by way of the first resistor and renewed measurement of the time duration N1 between the commencement of the now occurring charging process of the capacitor and the change of the output voltage of the comparator; and
      e) computation of the threshold voltage U th of the comparator according to the following formula: U th = U 1 ⋅ ( 1 - e ( N 3 N 2 - N 1 ) ⋅ In ( U 2 U 1 ) )

      This procedure can be used for the measurement of a physical parameter by making use of a microcomputer.
    • 在用于一个比较器,所有的输出电压被以特征性方式改变时,其输入电压超过或如果其阈值电压以下时,涉及以下步骤的阈值电压的测量的过程:a)在第一个已知的应用 电压U1到由第一电阻器的方式连接到比较器的输入端的放电的电容器,并且电容器和所述比较器的输出电压的变化的,由此发生的充电过程的开始之间的持续时间N3的测量; b)该电容器到已知的第一电压U1的进一步完全充电; c)该电容器由相同的电阻值与第一电阻器的第二电阻器的方式的放电,放电过程的开始和所述比较器的输出电压的变化之间的持续时间N2的测量; d)第二已知电压U2中,从第一电压U1不同,到电容器由第一电阻器的方式的应用和新的测量电容器的现在发生的充电过程的开始和的变化之间的持续时间N1的 比较器的输出电压; 和e)的阈值电压U个比较雅丁以下公式的计算:U TH = U 1 <(1 - E(N 3 N 2 - N + 1)<在(U 2 U 1))此过程可以 通过使用微型计算机的用于物理参数的测量。