In this lab experiment, we will be building our own function generator using two new types of op amp circuits.
- Wire up the following RC relaxation oscillator circuit (see Introduction to read about its functionality):
- Is the output as expected? Provide a screenshot in your report.
- What is the frequency of oscillation?
o The frequency should be equal to f=1/(2.2*R1*C1). Is this what you measure?
- Does the frequency change as expected when R1 is changed?
- Cascade an integrator circuit to the output as shown below:
- Is the integrator working as expected? Explain and provide a screenshot.
- Measure the DC offset of Vout2.
o Note: DC offset is the average voltage of your waveform.
- Eliminate the DC offset by placing a DC blocking capacitor (any capacitor between 0.1uF and 1uF) in between the RC relaxation oscillator and integrator. Provide a screenshot.
- Now add on to your circuit so that it also generates a sinusoid. Provide a screenshot.
- Build a gain stage to your circuit to modulate the amplitude of your sinusoidal output.