Question 1:
- These simulations focused on the amplitude of the oscillator’s output. In the ideal case (gain = 3.0), is the output distorted? That is, is it anything other than a perfect sinewave?
Answer 1:
In theory, the simulated output is a very pure sinewave, limited only by the numerical precision of the computer.
Question 2:
- What would happen if you built the circuit in Figure 5 with a real op amp in a noninverting gain of 3.0, but the actual gain was a little higher than 3? Would the output increase to the ±15 teravolts shown in the simulation? (Hint: Put it into LTspice, and don’t forget to use reasonable power supply voltages for the op amp.)
Answer 2:
The output would increase until the positive and negative peaks approached the headroom requirements of the op amp’s output stage. This may not be symmetrical, and exact behavior will depend on any additional loading at the output.
See the article:https://www.analog.com/en/resources/analog-dialogue/studentzone/studentzone-october-2025.html