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6: Operational Amplifiers

6: Operational Amplifiers6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 1 / 12 Operational Amplifier6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V ) Operational Amplifier6: Operational Amplifi

Requires negative feedback. 3. Assume zero input current: in most circuits, the current at the op-amp input terminals is much smaller than the other currents in the circuit, so we assume it is zero. Analysing op-amp circuits 6: Operational Amplifiers

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Transcription of 6: Operational Amplifiers

1 6: Operational Amplifiers6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 1 / 12 Operational Amplifier6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V ) Operational Amplifier6.

2 Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V )The gain,A, is usually very large: 105at low Amplifier6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V )The gain,A, is usually very large: 105at low input currents are very small: Amplifier6.

3 Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V )The gain,A, is usually very large: 105at low input currents are very small: it is a complicated circuit withabout 40 components, but we can forgetabout that and treat it asan almostperfect dependent voltage Amplifier6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers.

4 6 2 / 12An op amp ( Operational amplifier) is acircuit with two inputs and one (V+ V )The gain,A, is usually very large: 105at low input currents are very small: it is a complicated circuit withabout 40 components, but we can forgetabout that and treat it asan almostperfect dependent voltage circuit pins arenumbered anti-clockwise fromblob or notch (when lookingfrom above).Negative Feedback6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off Feedback6.

5 Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original Feedback6.

6 Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original op-amp outputYfallsthenV will fall bythe same amount so(V+ V )willincrease.

7 This causesYtorisesinceY=A(V+ V ).Negative Feedback6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original op-amp outputYfallsthenV will fall bythe same amount so(V+ V )willincrease.

8 This causesYtorisesinceY=A(V+ V ).Y=A(X Y)Negative Feedback6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original op-amp outputYfallsthenV will fall bythe same amount so(V+ V )willincrease.

9 This causesYtorisesinceY=A(V+ V ).Y=A(X Y)Y(1 +A) =AXNegative Feedback6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original op-amp outputYfallsthenV will fall bythe same amount so(V+ V )willincrease.

10 This causesYtorisesinceY=A(V+ V ).Y=A(X Y)Y(1 +A) =AX Y=11+1/AX Xfor largeANegative Feedback6: Operational Amplifiers Operational Amplifier Negative feedback Analysing op-amp circuits Non-inverting amplifier Voltage Follower Inverting Amplifier Inverting SummingAmplifier Differential Amplifier Schmitt Trigger Choosing Resistor Values Analysis of Circuits (2017-10110) Operational Amplifiers: 6 3 / 12In a central heating system, if the temperature falls too lowthe thermostatturns on the heating, when it rises the thermostat turns it off feedbackis when the occurence of an event causes something tohappen that counteracts the original op-amp outputYfallsthenV will fall bythe same amount so(V+ V )willincrease.

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