| 摘要 |
PURPOSE:To shorten a time required for the clear of a capacitor by connecting a level limiter circuit to the drain output of a differential MOSFET to reduce an output voltage difference. CONSTITUTION:When the level difference between a reference voltage Vref and an input signal (in), a drain voltage is sharply changed in accordance with gain due to the amplifying operation of differential MOSFETs Q1, Q2. If the drain voltage is changed so as to exceed the threshold voltage of MOSFETs Q9, Q10 by regarding a level limiter voltages as a reference, the MOSFETs Q9, Q10 is turned to the ON state, so that a load resistance value is suddenly reduced. Consequently, amplification gain is limited, so that the drain voltage of the differential MOSFET Q1 or Q2 is practically limited to a fixed level. |
