With audio power amplifier the terminology of "damping factor" often is used for: nominal_load_impedance / amplifier_output_impedance.You have performed the setup to find the Output impedance,
I wonder: Why you have a such powerful, paralleld output stage when the nominal_load is 800 Ohms?
Isn´t this overkill?
It's DC offset, irrelevant for damping factor. You will be only measuring AC voltage.Without the voltage source, the measured output before degeneration resistor (out1 node) is about 14mV.
0.55 mV peak-peak, I believe. Corresponding to 0.22 ohm output impedance.I've to see only the voltage swing, right? Then is about to 1mV.
Voltage swing is roughly factor 100 of the previous measurement (= about same output impedance), but the waveform is rather distorted. Suggests that either class AB bias current or loop gain is insufficient.With the voltage source and a nominal load of 8ohm I obtain this.
Fine, but doesn't fit well the nonlinear output impedance showing in post #11. May be something has changed between both simulations. However, I'm not motivated to guess much about it. Either post the complete simulation circuit or find the reason yourself.the distortion at 1kHz@8ohm - 50W is perfect and ultralow.
Fine, but doesn't fit well the nonlinear output impedance shown in post #11. May be something has changed between both simulations. However, I'm not motivated to guess much about it. Either post the complete simulation circuit or find the reason yourself.
"Read better"? Why did you select this useless test point? Please repeat with useful conditions, measuring at out node.Read better, the non-linear wave that you see, is the wave measured before the degeneration resistor (0.1ohm) and with the voltage source applied to the output, when the input is grounded.
Nominal_load_impedance = 8 Ohms.nominal_load_impedance / amplifier_output_impedance.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?