Phys 351 Lab 6

Phys 351 Lab 6 - Lab 6: Op-Amps- Part 2 Peter Bohlen Phys...

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Lab 6: Op-Amps- Part 2 Peter Bohlen Phys 351, Lab Section 457, Mondays 5-8 Honor Pledge ______________
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Section A: Analog Computer In A-1 a differentiator was built using a .0uF capacitor and a 10kOhm resistor. The resulting circuit is shown below. - The output for a 1kHz sine, square and triangular wave inputs are shown below - , R Vout ic - = , dt dVin C ic = dt dVin CR Vout = - The device appeared to perform an accurate derivative for the frequency range of 500Hz to 18kHz. - After adding a resistor in parallel with the capacitor, and a capacitor in series with the resistor. The resistor added had a value of 100pF, and the resistor added had a value of 1kOhm. The main difference observed upon adding these new components was that with a square wave input, the derivative no longer has such a sharp jump toward infinity where the input jumps from –A to A or vice versa. Also with signals at high frequencies, the transfer function becomes –R2/R1 since the impedance of the capacitor goes to infinity and draws no current.
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A-2. Integrator In A-2, an integrator with a .1uF capacitor and a 100kOhm resistor was hooked up. The following circuit was built. U1 3288RT 1 2 5 4 3 1 2 0 3 R2 100kΩ C1 100nF - Using the slow scanning rates on the scope, the slope of the voltage ramp produced by the integrator was measured and compared to the theoretical value. With an input square wave with a slope of 0 and amplitude of 44mV, an output triangle wave was produced with a slope of 44mV/488uS. This is exactly what is theoretically predicted, a square wave input creating a triangle wave output with the same slope as the amplitude was of the square wave. - A 43kOhm resistor was added in parallel with the capacitor in the feedback loop of the integrator and a bode plot was taken. The bode plot is shown below. 0 0.05
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Phys 351 Lab 6 - Lab 6: Op-Amps- Part 2 Peter Bohlen Phys...

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