Lab 5 - ECE 421L
Mario Valles
March 6, 2015
Lab
description
- Calculate the frequency response of the following circuit. Ensure you show your clear hand calculations.
- What can you neglect to simplify the calculation?
- Does the circuit work if you remove the 100k? Why or why not?
- No, because the gain goes to infinite becuase of the op-amp offset
- Does the 100k have much of an effect on the frequency response?
- No it does not becuase the AC current will flow thrugh the capacitor.
- The Next figure is to shows an example of the gain and its phase.
- we can see that the output which is channel 2 (blue line) is starting to go down in amplitude and the phase is about 90 deg.
- Show, at the unity-gain frequency of the integrator, that the input and the output have the same peak values.
- From the frequency response equation above we see that the unity gain is at 159 Hz
- Is the phase shift between the input and the output what you expect? Why or why not?
- Yes it is, is about 90 deg. becuase the 100k effects are neglibles at low frequencies
- Next, design, simulate, and build a square-wave to triangle wave generation circuit.
- Assume the input/output frequency is 10 kHz and the output ramp must swing from 1 to 4 V centered around 2.5 V.
- Show all calculations and discuss the trade-offs (capacitor and resistor values, input peak, min, and average, etc.)
- The circuit that we use to get the triangle wave froma square with 10 Khz input and output from 1 to 4 V sweep arouund 2.5 is
- The graph we obtained:
Then with the experiment we obtained:
We choose a small capacitor and a bigger resistor to reduced the effect
of the DC offset we were obtaining. As an obserbation we noted
that the DC offset was affecting the triangular wave shape.
Our calculation are as follows
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