ONLY NEED PRELAB QUESTION!!! Look at the wave-form at point B (using a second DC

Question

ONLY NEED PRELAB QUESTION!!!

Look at the wave-form at point B (using a second DC coupled probe), note its shape and timing compared to point A as you adjust the first trim pot. It should look like the negative integral of the input. Adjust the trim pot until the rate of return to equilibrium is about2 V/ms. Explain via rough calculation how you can get such a long fall-time. Also explain why the diode is needed and what it does (try removing it and see what happens). What is the voltage range at point B for various input amplitudes? PRE-LAB Question 1: Calculate the "dynamic" voltage range for the flash ADC (Vr at the top comparator compared to Vef at the bottom one); look up flash adc' if needed). If this is too far out of the active range of the voltage divider, you may have to adjust the first or last resistor on the divider chain.

Explanation / Answer

The Vref_top for the top most comparator is given by the following-

5*17k/27k = 3.15 volts

The Vref_bot for the bottom most comparator is given by -

5*10k/27k = 1.85 volts

HEnce, dynamic range is 3.15/1.85=1.105

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