I have the amp in the enclosed spice schematic up and running on a breadboard. It sounds fine.
I also have an ac analysis of the amp in ltspice enclosed. If I understand the plot correctly, this amp should be unstable.
What am I missing? The miller cap was chosen to get a crossover freq of 500khz. As I understand it from Cordell's book (you may notice its his spice models I'm using), the pole at the miller cap should not cause more than 90 degrees of phase lag. Does this mean that there is another pole that is in play here? Like I said, I have this amp up and running with no obvious problems.
The only discrepancy between the spice sim and the built amp is the output transistors. The actual build has mje 2955/3055. I don't have models at hand for those. I don't see that this would be a factor though.
Is the sim correct, and I don't know how to interpret the data? Is the sim correct and my amp is unstable and it hasn't been audible/noticeable yet? Is there a problem with my sim?
Any ideas?
I also have an ac analysis of the amp in ltspice enclosed. If I understand the plot correctly, this amp should be unstable.
What am I missing? The miller cap was chosen to get a crossover freq of 500khz. As I understand it from Cordell's book (you may notice its his spice models I'm using), the pole at the miller cap should not cause more than 90 degrees of phase lag. Does this mean that there is another pole that is in play here? Like I said, I have this amp up and running with no obvious problems.
The only discrepancy between the spice sim and the built amp is the output transistors. The actual build has mje 2955/3055. I don't have models at hand for those. I don't see that this would be a factor though.
Is the sim correct, and I don't know how to interpret the data? Is the sim correct and my amp is unstable and it hasn't been audible/noticeable yet? Is there a problem with my sim?
Any ideas?