The reduction of input open-fault in a CMOS Schmitt-Trigger inverter

The failure of the CMOS Schmitt-trigger inverter open-fault and capacitor in case a oscillator circuit cause self-oscillation device. It leads to high frequency be emitted on output side, because balance internal smaller parasitic capacitance approximately 5 – 20 pF. In this article, reduction is presented, by adding between Gate pin Drain Q1 demonstration illusion an equivalent circuit. This causes unbalance, then input will not accord. Besides circuit, feedback resistor combined with capacitance. However, it added capacitance, higher does occur. was tested PSPICE computer simulation program.