Op-Amps

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  • Topic: Operational amplifier, Phase, Electronic amplifier
  • Pages : 10 (2060 words )
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  • Published : November 10, 2012
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Title: Operational Amplifier, OP-AMP
Abstract:
In the experiment, the application involving the operational amplifier was investigated. A ±15volts voltage is supplied to the op-amp. The 15volts also the working ranges for the op-amp. There are two basic op-amp circuit, inverting and non-inverting amplifier. For an ideal op-amp, the voltage gain of the circuit is the function of ratio of resistor. There are also other configuration investigated like the buffer amplifier which has the same input and output voltage and the summing amplifier. When a capacitor is connected as a feedback element, the output voltage is the integral of the input voltage. The summing and difference amplifier is basically the same concept with the basic circuit of inverting amplifier Introduction:

Operational amplifier, op-amp is a voltage amplifier electronic device. There are several kind of op-amp like linear, non-linear and frequency dependant. The op-amp is normally made up of 20-30 transistors. Below are the examples of the most common op-amp. The op-amp is three terminal devices, which is inverting terminal, non-inverting terminal and the output terminal. In the ideal case, op-amp has a infinite input impedance, infinite open-loop voltage gain and zero output impedance.

The invention of op-amp is still new which less than 100years. However, the op-amp is now widely used in electronic device or even the musical instrument. Using different connection to the input resistance and feedback resistance, the op-amp can bring out different kind of application. The most common inverting amplifier is actually the same concept and function with the RC circuit. Op-amp can use in low pass and delay function. Equipments and Components

a) µ741 Op-Amp. 2x (100 kΩ, 20 kΩ, 10 kΩ), 2kΩ, 1.5 kΩ, 100Ω, 4.7 nF b) Signal Function Generator, Oscilloscope, DC power supply

Procedure:
+15V and -15V was connected to pin 7 and pin 4 respectively for the op-amp. Pin 1,5,8 remain no connection. 4.1 Inverting Scaling Amplifier

a) The inverting amplifier circuit was connected as shown in above. b) The inverting amplifier circuit was connected with R1 = 20kΩ and Rf = 100kΩ. The resistors, R1 and Rf were measured. c) The input was applied with sine wave, 1 kHz and amplitude 0.5 V d) The input and output waveforms were sketched and the phase inversion was noted. e) Rf/R1 was calculated. Vout peak amplitude was measured. f) Multisim was used to simulated.

4.2 Non-inverting Scaling Amplifier

a) The non-inverting amplifier circuit was connected as shown in above. b) The non-inverting amplifier circuit was connected with R1=20kΩ and Rf=100kΩ. c) The input was applied with sine wave, 1 kHz and amplitude 0.5 V d) Input and output waveforms ware sketched and the same phase was noted. e) (1 + Rf/R1) was calculated. Vout amplitude was measured. f) Multisim was used to simulate.

4.3 Buffer amplifier (unity gain voltage follower)

a) The buffer amplifier circuit was connected as shown in above. b) The input was applied with sine wave, 1 kHz and amplitude 0.5 V c) The input and output waveform were sketched.
d) Vout amplitude was measured.
e) The purpose of the buffer amplifier was illustrated.
4.4 Summing Amplifier

a) The summing amplifier circuit was connected as shown in above. b) The circuit was connected with R1 = 20kΩ, R2 = 100kΩ and Rf = 100kΩ. c) The input was applied with sine wave, 1 kHz and amplitude 0.5 V d) The input and output waveforms were sketched.

e) Vout amplitude was calculated. The measure value was noted.

4.5 Integrator Amplifier

Figure 4.5
a) The integrator amplifier circuit was connected as shown in above. b) The circuit was connected with R1 = 1.5 kΩ and Cf = 4.7 nF . c) Both input were applied with square wave, 1 kHz and amplitude 0.5 V. d) The input and output waveforms were sketched.

e) Sine wave and cosine was repeated for...
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