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do i find another better F5
do i find another better F5
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Old 26th October 2008, 10:05 AM   #1
john-china is offline john-china
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Default do i find another better F5

look at f5 circuit.
when i disconnect GND from resistor of JFET souce pin, i found better performance in my simulation circuit.

in orignal f5 circuit , i got distortion =0.02% ,gain = 5 , dc offset=250mv
in no-ground f5 circuit , i got distortion=0.009%, gain=0.8(too small) dc offset = 80mv

BTW, my attachment pic is not mine , which is from website.
i use multisim from NI to simulate F5.

can somebody tell why ,which one is better.
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File Type: gif simulation.gif (29.3 KB, 369 views)
Maybe i should not be lazy again
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Old 26th October 2008, 10:46 AM   #2
analog_sa is offline analog_sa  Europe
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I don't have the original circuit but looking at your attachment it seems you have increased the negative feedback, hence the reduction in gain and distortion.
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Old 26th October 2008, 10:48 AM   #3
Magura is offline Magura  Denmark
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If you take a look at your figures, you'll see that the distortion per dB of gain, is higher in the 0.8dB gain version.


Edit: Not that I see a reason to lower the distortion of the original circuit??
Everything is possible....to do the impossible just takes a little while longer.
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