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Operational Amplifier Circuit Templates This presentation is partially animated. Only use the control panel at the bottom of screen to review what you have seen. When using your mouse, make sure you click only when it is within the light blue frame that surrounds each slide. AInc. Pre-presentation Self Assessment Activity Your comfort level with your response to the following four question assessment tool should indicate if the presentation that follows will increase you knowledge base on the topic outlined by the questions in this tool. Pre-presentation Self Assessment Activity 1. What is the general operational rule for an Operational amplifier? 2. What is the operational amplifier configuration for a comparator circuit. 3. What is the operation amplifier configuration for a current to voltage converter? 4. What is the operation amplifier configuration for a voltage inverting circuit? Operational Amplifier fundamental knowledge base. Operational background and pin out for the 741 op amp. Operational amplifier configuration for a comparator circuit. Operation amplifier configuration for a current to voltage converter. Operational amplifier configuration for a voltage inverting circuit. Operational amplifier configuration for a non-inverting circuit. Operational amplifier property summary and post assessment questions. Operational Amplifiers have high impedance inputs. Op Amp have a low impedance output. have an output signal that is a multiple of the input signal ( Op Amp Gain) Operational Amplifiers work by following one simple rule!! Create a voltage output signal that is proportional to the difference of the voltage signals on the input terminals. Engineers work successfully with Op Amps by following one simple rule!! Feed (in various clever ways) the output signal back to one of the input signals to bring the voltage difference between the input terminals back to zero. 14 13 12 11 + V 10 741 9 8 741 Quad amplifier DIP package 741 1 2 741 3 4 V - 10 6 7 V + input 1 + output Operational Amplifier input 2 - 741 (Op Amp) V - Operational Amplifier (Op Amp) input section of op amp circuit input 1 + To n input 2 p n 741 p n the rest of the circuit n To the rest of the circuit input section of op amp circuit Operational Amplifier (Op Amp) input 1 + To the middle section of the Op circuit n input 2 p n 741 p n n n output terminal p To the middle section of of the Op circuit n output section of op amp circuit input section of op amp circuit Operational Amplifier (Op Amp) input 1 + Output stage (section) of an operational amplifier is usually an emitter-follower circuit. n input 2 p n 741 n output terminal p p - n n n output section of op amp circuit Operational Amplifier (Op Amp) Output stage (section) of an operational amplifier is usually an emitter-follower circuit. 741 n output terminal p n output section of op amp circuit Voltage drop across here goes up/down down as emitter voltage output goes up/down. Operational Amplifier (Op Amp) Output stage (section) of an operational amplifier is usually an emitter-follower circuit. Voltage signal at the emitter goes up/down as the base signal goes up/down. n p n output terminal Voltage drop across here goes up/down down as emitter voltage output goes up/down. Operational Amplifiers work by following one simple rule!! Operational Amplifier (Op Amp) n n p n n p n output terminal p n Voltage drop across here goes up/down down as emitter voltage output goes up/down. Operational Amplifiers work by following one simple rule!! The circuit components between the input section and output section of an operational amplifier Input 1 Op amps always adjust the signal at the output terminal if the voltage difference between the two input terminals (input 1 and input 2) is not zero. V not equal to 0 Input 2 n n p p n n n output terminal p n Voltage drop across here goes up/down down as emitter voltage output goes up/down. Operational Amplifiers byconfigured followingasone simple rule!! The Operational Amplifierwork can be a Comparator circuit. The circuit components between the input section and output section of an operational amplifier Op amps always adjust the signal at the output terminal if the voltage difference between the two input terminals (input 1 and input 2) is not zero. input 1 + Input 1 output terminal V not equal to 0 n p input 2 n p Input 2 Voltage here is only - Let’s look at the simplest application of an operational amplifier. n n n output terminal p n zero when the voltage drop between (across) input 1 and input 2 is zero. Voltage drop across here goes up/down down as emitter voltage output goes up/down. Click here to return to topic menu Operational Amplifier Comparator circuit input 1 output terminal + input 2 LED will be ON if voltage here is zero. - V+ Operational Amplifier Comparator circuit V- Note: This time V is zero volts. Signal from outside world enters here. input 1 output terminal + Vinput 2 LED will be ON if voltage here is zero. zero (i.e. when the voltage drop across input 1 and input 2 is zero.) - V+ Operational Amplifier Comparator circuit This low signal has the same voltage value as the selected voltage at input 2. V- input 1 output terminal + VR Voltage drop between the 2 inputs is now zero. input 2 adjustable LED will be ON if voltage here is zero (i.e. when the voltage drop across input 1 and input 2 is zero.) This setting puts a desired voltage at input 2. V+ Operational Amplifier Comparator circuit This high signal is greater than the voltage value selected at input 2. V- LED becomes reverse biased and no current is allowed to flow through it. input 1 output terminal + VR Voltage drop between the 2 inputs is NOT zero. input 2 adjustable LED will be OFF since voltage here is greater than zero (i.e. when the voltage drop across input 1 and input 2 is not zero.) - V+ Comparator Op Amp circuit V- Actually, there is, at all times, always one of three possible signals at the output terminal of an op amp configured as a comparator. V + zero volts input 1 output terminal + - V VR input 2 adjustable The output is only at zero volts when the voltage at input 1 exactly equals the voltage at input 2. - V+ Click here to return to topic menu Current to Voltage Op Amp circuit This op amp circuit monitors the current at input 2 and produces an output terminal voltage that is the inverse of the input signal form. V input 1 + IS input 2 - The current signal is applied to input 2 EE VO = I A high impedance input output terminal A high impedance input V+ CC R1 S R 1 VO This output is a voltage signal that is the inverse of the input signal. Click here to return to topic menu Voltage Inverting Op Amp circuit This op amp circuit monitors the voltage at input 2 and produces an output terminal voltage that is the inverse of the input signal form. V input 1 + R1 Vi The voltage drop is presented to input 2 input 2 - EE A high impedance input output terminal A high impedance input This negative sign indicates output voltage will be inverted. VO = - Vi V+ CC Rf R f R 1 VO This output is a voltage signal that is the inverse of the input signal. Click here to return to topic menu Voltage Non-Inverting Op Amp circuit V input 1 Vi + This positive R1 sign indicates output voltage will not be inverted. input 2 - - This op amp circuit monitors the voltage at input 2 and produces an output terminal voltage that is the a non-inverted multiple of the input signal form. EE A high impedance input VO = + Vi output terminal A high impedance input V+ CC Rf R + R f i R VO This output is a voltage signal that is not the inverse of the input signal. 1 Click here to return to topic menu Operational Amplifiers have high impedance inputs. have a low impedance output. have an output signal that is a multiple of the input signal ( Op Amp Gain) Operational Amplifiers work by following one simple rule!! Create a voltage output signal that is proportional to the difference of the voltage signals on the input terminals. Engineers working with Op Amps following one simple rule!! Feed (in various clever ways) the output signal back to one of the input signals to bring the voltage difference between the input terminals back to zero. Post Presentation Self Assessment Activity 1. What is the general operational rule for an Operational amplifier? V+ input 1 output terminal + input 2 V- If the voltage signal at both inputs are equal the output voltage is zero volts. Post Presentation Self Assessment Activity 2. What is the operational amplifier configuration for a comparator circuit. + - V+ Post Presentation Self Assessment Activity 3. What is the operation amplifier configuration for an current to voltage converter? V EE + VO IS V+ CC R1 Post Presentation Self Assessment Activity 4. What is the operation amplifier configuration for a voltage inverting circuit? V EE VO R1 V+ CC Rf End of Presentation AInc.