Ridiculously low distortion from brain-dead CLASS-B circuit in simulation?

bigwill · 3rd May 2010, 09:38 PM

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???

bigwill · 3rd May 2010, 09:48 PM

Oh dear, the numbers aren't so impressive at 20Khz

Bigun · 3rd May 2010, 09:59 PM

How do you know it's Class B - what does the current flowing through the output devices and Q1 look like ?

bigwill · 3rd May 2010, 10:04 PM

Alright, I did some tweaking (basically made the "slow down" capacitor way smaller) and got the following spectra at 20Khz

bigwill · 3rd May 2010, 10:06 PM

WHOOPS that is definitely NOT Class-B

bigwill · 3rd May 2010, 10:11 PM

Ok, here's the depressing reality!

3rd May 2010, 09:38 PM	#1
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	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???

3rd May 2010, 09:59 PM	#3
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	How do you know it's Class B - what does the current flowing through the output devices and Q1 look like ? __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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3rd May 2010, 09:48 PM	#2
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	Oh dear, the numbers aren't so impressive at 20Khz

3rd May 2010, 10:04 PM	#4
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	Alright, I did some tweaking (basically made the "slow down" capacitor way smaller) and got the following spectra at 20Khz

3rd May 2010, 10:06 PM	#5
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	WHOOPS that is definitely NOT Class-B

3rd May 2010, 10:11 PM	#6
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	Ok, here's the depressing reality!

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