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18th January 2006, 08:42 PM  #1 
diyAudio Member
Join Date: Nov 2005
Location: serbia, zajecar

help ! how to calculate??????????
how to calculate output impedance of these amp stages?

18th January 2006, 09:34 PM  #2  
diyAudio Member
Join Date: Mar 2002
Location: AveiroPortugal

Re: help ! how to calculate??????????
Quote:
Amp stage A  the output impedance is the value of R4 in parallel with R5 Amp stage B  1/Gm ( Gm is the transconductance of the mosfet ) in parallel with R9 and R6. Cheers
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18th January 2006, 10:05 PM  #3  
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Join Date: Feb 2005
Location: Zagreb

Re: Re: help ! how to calculate??????????
Quote:


18th January 2006, 10:15 PM  #4  
diyAudio Member
Join Date: Mar 2002
Location: AveiroPortugal

Re: Re: Re: help ! how to calculate??????????
Quote:
Hi ilimzn But if you assume that R5 and R6 are the DC current path for charging the capacitors C2/C4 and part of the design , the output impedance is calculated as I have said.
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