Semiconductor integrated circuit device

TL;DR: In this article, the authors proposed to reduce the generation of overshoot or undershoot and attain high speed output signal by inserting a resistor between a source of an input element and a power supply line, and providing a switch element in parallel with a resistor.

Abstract: PURPOSE:To reduce the generation of overshoot or undershoot and to attain high speed output signal by inserting a resistor between a source of an input element and a power supply line, and providing a switch element in parallel with a resistor. CONSTITUTION:A resistor R1 is inserted between a source of a P-channel output MOSFET Q1 and a power supply line Vcc, a resistor R2 is inserted between a source of an N-channel output MOSFET Q3 and a ground line and a P- channel MOSFET Q2 and an N-channel MOSFET Q4 are provided respectively in parallel with the resistors R1, R2. Then the FETs Q2, Q4 are subject to complementary switch control with an output MOSFET Q1 or Q3 with a proper delay time with respect to an input signal Di by an output signal Do. The switch MOSFETs Q2, Q4 are changed from the on-state into the off-state when the output signal in close to the ground level or power level and a resistor is inserted in series with the output MOSFET to reduce undershoot or overshoot and to attain high speed output signal.