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opamp non-inverting schmitt trigger

Definition

An operational amplifier (short op-amp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and a single-ended output.

All amplifier circuits have the feedback to the negative input!
An Op-Amp does not draw current from the input!

Voltage Follower/Buffer

Voltage Follower
Voltage Follower

Vout=VinV_{\mathrm{out}} = V_{\mathrm{in}} Provides current at the output without loading the input.

Non-Inverting Amplifier

Non-Inverting Amplifier
Non-Inverting Amplifier

Vout=(1+R2R1)VinV_{\mathrm{out}} = \left(1 + \frac{R_2}{R_1} \right) V_{\mathrm{in}}

with resistances $R_1, R_2 \in \R$ and the voltages $V_{\mathrm{in}}, V_{\mathrm{out}} \in \R$.

Inverting Amplifier

Inverting Amplifier
Inverting Amplifier

Vout=R2R1VinV_{\mathrm{out}} = -\frac{R_2}{R_1} V_{\mathrm{in}}

with resistances $R_1, R_2 \in \R$ and the voltages $V_{\mathrm{in}}, V_{\mathrm{out}} \in \R$.

Differential Amplifier

Differential Amplifier
Differential Amplifier

Vout=R2R1(V1+V2R4R4+R3)+R4R4+R3V2V_{\mathrm{out}} = \frac{R_2}{R_1}\left(- V_1 + V_2 \frac{R_4}{R_4 + R_3}\right) + \frac{R_4}{R_4 + R_3} V_2

with resistances $R_1, R_2, R_3, R_4 \in \R$ and the voltages $V_{\mathrm{in}}, V_{\mathrm{out}} \in \R$.

Schmitt-Trigger

Schmitt Trigger
Schmitt Trigger

Offset: VrefR2R1+R2V_{\mathrm{ref}} \frac{R_2}{R_1 + R_2}
V+=(VinVout)R4R3+R4V^{+} = (V_{in} - V_{out}) \frac{R_4}{R_3 + R_4}
Bias: ΔV\Delta V