94 V This was relatively close to the theoretical ratio calculated from the

94 v this was relatively close to the theoretical

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1.94 V. This was relatively close to the theoretical ratio calculated from the resistors. Operational amplifiers suffer a small amount of voltage loss during operation which may cause a slight difference in the values obtained experimentally. A supply voltage of ±3V was used across the positive and negative terminals of the op-amp. V gain (resistors) = Rf/ Ri = 2 kΩ/1 kΩ= 2V V gain(amplitudes) = Vo/ Vi =2.08V/1.07V = 1.94 V b) Measured Gain (calculated from resistors) Measured from oscilloscope plot R i R f Peak-to-peak V i Peak-to-peak V o Gain 1kohms 2kohms 3 1.13V 3.14V 2.778V Table 2
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BMEN 3120 Operational Amplifiers When dealing with a noninverting amplifier, the gain is one volt higher than that of an inverting amplifier, because one must be added to the ratio of the resistors to obtain the proper gain . Non-inverting amplifiers can maintain higher gain than inverting amplifiers. The input and output wavves gave a similar gain ratio around 2.778 V. This was still a relatively close result to the theoretical gain ratio. Some variation may have resulted, due to a small amount of voltage loss in the op amp even though constant input voltage is mostly maintained throughout. A supply voltage of ±3V was used across the positive and negative terminals of the op-amp. V gain (resistors) = Rf/ Ri +1 = 2 kΩ/1 kΩ + 1= 3V V gain(amplitudes) = Vo/ Vi +1 = 3.14 V/1.13V +1 = 2.778 V c)
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BMEN 3120 Operational Amplifiers × == -2.55V ??:??? ???? =-2.37V ??:??? × = 2.55V ??:?? ? ???? = 1.77V ??:??? The oscilloscope results prove the voltage gain ratio for a supply voltage of ±3V. When this amount of voltage supplies were applied to an non-inverting op-amp circuit, a square output waveform resulted. When the input voltage amplitude is multiplied by the voltage gain it gives the output voltage amplitude. For example, as as shown above Vi:min x Gain Vo:min. The slight variation may be due to slight experimental voltage loss in the op amp. d)
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BMEN 3120 Operational Amplifiers × = -2.55V ??:??? ???? × = 2.55V ??:?? ? ???? = -2.73V ??:??? =2.69V ??:??? The part d oscilloscope results above prove the voltage gain ratio for a supply voltage of ±5V. When changing the supply voltage from ± 3V to 5V a larger sine wave resulted rather than a square wave as shown in part c. When the input voltage amplitude is multiplied by the voltage gain it gives the output voltage amplitude. For example, as as shown above Vi:min x Gain Vo:min. The slight variation may be due to slight experimental voltage loss in the op amp or systematic error from the oscilloscope used.
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