Differential-Amp Circuits Lab Report Example | Topics and Well Written Essays - 750 words

Differential-Amp Circuits - science lab Report ExampleFrom figure 2, the input prognostic was equal to the return signal (unity amplification), and in the uniform phase (the non-inverting amplifier) both the upper and lower Op Amps were buffer circuits. The value of output was 19.9V because the Op Amp was not ideal.V1a = V1d = 0.2V V1b= 0V V3a = 1.16V V3b = -0.96V V3d = 2.12V Afd = 10.6 Afd % misplay = 4.4% R4 = 0.97k R5 = 0.97k Average of R5 and R4= 0.97k R6 = 9.80k R7 = 9.84k Average of R7 and R6 = 9.82kFor better suppression or reduction of common mode gain, there was a potentiometer connected to the LM1458C op amps. The potentiometer maintained output voltage at OV when differential input voltage is not applied. The nulling potentiometer improved common-mode gain of small input voltage by availing even small input voltages, V1a=0.2V was suppressed to V3a=1.16V as seen in figure 3.A bridge was made for the generation of 2 different voltages. There was a difference in betwe en measured and calculated voltages due to permissiveness or level of uncertainty. The differential gain was obtained through the connection of bridge to respective inputs of the amplifier. The output voltages at the connected bridge were nearly similar to the unconnected bridge this is because they are connected to the Op Amp inputs that founder input resistance of not less than several hundred k (LM1458C has 2M) V1a was equal to V1b with voltage of 0.197V which corresponded to output 21.3V. The measured differential gain was 107.878.There was minimal signal picked as observed from the oscilloscope, this was due to aimless and DC offset. This problem was caused by low-frequency DC signal since DC is zero frequency. We could have constructed a high gear pass filter with very low cutoff frequency so that the Electro Cardiograms signal not to degrade. So both large capacitor of more than 1F and large ohmic resistance of more than 1M should have been put in place.The instrumentati on