Calculadora de Gatilho de Schmitt

Projete um circuito Schmitt Trigger calculando os limiares de comutação superior e inferior.

V
V
kΩ
kΩ

Upper Threshold (V_TH)

1.091 V

Lower Threshold (V_TL)-1.091 V
Hysteresis Width2.182 V

Upper Threshold (V_TH) vs Positive Saturation

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Formula

## Inverting Schmitt Trigger ### Formulas **V_TH = V_sat+ x R1 / (R1 + R2)** **V_TL = V_sat- x R1 / (R1 + R2)** **Hysteresis = (V_sat+ - V_sat-) x R1 / (R1 + R2)** The ratio R1/(R1+R2) sets the threshold as a fraction of the saturation voltages.

Exemplo Resolvido

Op-amp saturates at +/-12 V, R1 = 10k, R2 = 100k.

  1. 01V_TH = 12 x 10/110 = 1.091 V
  2. 02V_TL = -12 x 10/110 = -1.091 V
  3. 03Hysteresis = 24 x 10/110 = 2.182 V

Perguntas Frequentes

What is a Schmitt trigger used for?

Converting noisy or slowly changing signals into clean digital edges. Common in signal conditioning and oscillators.

How do I make the thresholds asymmetric?

Add a voltage divider bias to the non-inverting input or use diodes to create different feedback paths.

Inverting vs non-inverting Schmitt trigger?

Inverting: input to inv. pin, feedback to non-inv. Non-inverting: input to non-inv., feedback also to non-inv. Formulas differ.

Aprender

Ohm's Law Guide

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