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Old 3rd May 2010, 09:38 PM   #1
bigwill is offline bigwill  United Kingdom
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Default Ridiculously low distortion from brain-dead CLASS-B circuit in simulation?

Playing around in ltspice, I managed to create the following nonsense:

(Warning: large image, you'll probably need to scroll it)


The output transistors aren't even biased yet I somehow achieved H2 down 110dB, H3 down 140dB

Would this even work in reality???

Last edited by bigwill; 11th September 2012 at 09:46 AM.
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Old 3rd May 2010, 09:48 PM   #2
bigwill is offline bigwill  United Kingdom
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Oh dear, the numbers aren't so impressive at 20Khz
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Old 3rd May 2010, 09:59 PM   #3
Bigun is offline Bigun  Canada
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How do you know it's Class B - what does the current flowing through the output devices and Q1 look like ?
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Old 3rd May 2010, 10:04 PM   #4
bigwill is offline bigwill  United Kingdom
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Alright, I did some tweaking (basically made the "slow down" capacitor way smaller) and got the following spectra at 20Khz
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Old 3rd May 2010, 10:06 PM   #5
bigwill is offline bigwill  United Kingdom
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WHOOPS that is definitely NOT Class-B
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Old 3rd May 2010, 10:11 PM   #6
bigwill is offline bigwill  United Kingdom
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Ok, here's the depressing reality!
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