- #1

- 8

- 8

- TL;DR Summary
- Hi everyone,

I have a good understanding of how an oscillator circuit is supposed to work, meaning zero phase shift and gain bigger than unity; however, I have not been able to make one work in practice. I am trying to utilize an LM741 op-amp. I have tried a colpitts circuit, but I will use any topology at this point just to see it work at this high of a frequency, 10-50MHz.

Questions:

1. Is LM741 capable of oscillating at 10MHz? If not, could you suggest me an affordable op-amp for this operation?

2. How likely am I, as a beginner to be able to design a zero phase shift feedback filter to use with a non-inverting op-amp circuit to create an oscillator?

3. If an inverting op-amp circuit is the way to go, how should I go about the feedback circuit? I have been trying to make a feedback circuit with low loss in the pass-band (-6dBish), and 180 degrees phase shift, but I can't get both of them at the same time. At best, I was able to get -13dB loss and 180 degrees phase shift, but I am unsure if my op-amp gain can compensate for 13dB plus a little.

Please take a look at my simulation for the filter/feedback portion in ADS. (images forum1 and forum2 belong to the same simulation, forum 3 is independant)

Any help/input will be appreciated.

Thanks all!

1. Is LM741 capable of oscillating at 10MHz? If not, could you suggest me an affordable op-amp for this operation?

2. How likely am I, as a beginner to be able to design a zero phase shift feedback filter to use with a non-inverting op-amp circuit to create an oscillator?

3. If an inverting op-amp circuit is the way to go, how should I go about the feedback circuit? I have been trying to make a feedback circuit with low loss in the pass-band (-6dBish), and 180 degrees phase shift, but I can't get both of them at the same time. At best, I was able to get -13dB loss and 180 degrees phase shift, but I am unsure if my op-amp gain can compensate for 13dB plus a little.

Please take a look at my simulation for the filter/feedback portion in ADS. (images forum1 and forum2 belong to the same simulation, forum 3 is independant)

Any help/input will be appreciated.

Thanks all!