| 摘要 |
PURPOSE:To improve the linearity of an integration circuit which obtains an integral output by utilizing the charging and discharging of a capacitor by providing a means which feeds part of the integral output back to the input side positively and compensating the charging voltage of the capacitor. CONSTITUTION:The buffer composed of an operational amplifier 4 is connected to the ground side of the capacitor 3 and a current source 1 is controlled slightly with the output of the buffer. When the voltage of the capacitor 3 is small, the current of the current source 1 is nearly equal to I and when the voltage V rises, the current of the current source 1 increases slightly with the output of the operational amplifier 4. For the purpose, the width of the increase of the current is set properly to obtain a voltage V with good linearity as shown in figure (a).
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