VT ∴Vo=-Vsat Schmitt triggers are better known as buffers or inverters in the logic world – but beware, not all gates are Schmitt triggers. Normally this shouldn’t affect the reference voltage in any way, but since there’s a feedback resistor, the reference voltage drops slightly below the nominal value because the feedback and the lower reference resistor are now in parallel with respect to ground (since a low output shorts that terminal of the resistor to ground). Hex inverting Schmitt trigger 11. The Schmitt Trigger is a type of comparator with two different threshold voltage levels. Hex non-inverting precision Schmitt-trigger Rev. The HEF40106B provides six inverting buffers. Comparators also have especially sensitive inputs because of their very high gain – even tiny changes in the input can cause instant change of state on the output. The transfer characteristics are shown below. These help to convert analog signal into digital. As this is an inverting Schmitt Trigger, the output pulse is inverted relative to the input. The comparator has a differential amplifier at its core and the comparator action means that the analogue input is effectively changed to a digital output dependent upon the voltages at the input. Thus in transfer characteristics we get a rectangle. If Vout=-Vsat , VT= -ve This is really confusing because, after simulating both non-inverting and inverting configurations of the Schmitt trigger, it is clear that, for the non-inverting circuit, the thresholds are ± = ± and for the inverting circuit, the thresholds are ± = ± +. The circuit now has two effective thresholds or states – it is bistable. 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