| 摘要 |
<p>PURPOSE:To obtain a required integrating circuit without using a large area of an element by arranging a switching element so that the time constant of the integrating circuit is changed at the rise and decay of an input signal. CONSTITUTION:When an input signal Vi is in the high level, a switch MOSFET T1 is off and an output Vo is in the high level. When the signal Vi is turned to the low level, the FET T1 is turned on by an inverter G1, the charge of the capacitance C is pulled ut from R2 like the FET T1 and the output Vo is suddenly decayed at a time constant R2.C. When the input signal Vi is turned to the high level again, the FET T1 is turned off and the capacitance C is charged by resistors R1+R2, so that the output Vo is gradually raised at a time constant (R1+R2).C.</p> |
