AN920 Posted May 22, 2007 Report Share Posted May 22, 2007 Next I increased the feedback cap to 22pF. Now the drive level was near 2.6mW (17 times higher), BUT note the rapid rise of harmonics from the osc (green circles) and we are no longer on the linear part of the power curve. The amplifier is now heavily into gain compression. Output of F1 is now 55mW and amp almost in full compression (no increase in input drive will provide higher output) as we have reached the flat part of the curve. Also note how the osc frequency shifted down as expected because of the higher capacitance.Here is also the plot for power in transistor with 47k base resistor connected with input drive stepped 1-10mW. Quote Link to comment Share on other sites More sharing options...
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