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An Independently/Electronically Controllable Schmitt Trigger Using only Single VDGA

This paper presents electronically tunable Schmitt trigger circuit based on voltage differencing gain amplifier (VDGA). The circuit comprises only 1 VDGA without any passive element. The threshold and output voltage levels of the proposed Schmitt trigger can be independently controlled by corresponding bias currents of the VDGA. The performance verification of proposed Schmitt trigger is depicted by PSpice simulation program with the model parameter 0.35μm CMOS process. The obtained results confirm the theoretical expectation. The total power consumption approximately 0.25mW, at ±1.5V. This proposed Schmitt trigger can further be used in control systems and signal generators.