Formula for Zout of diff pair

martyh · 8th January 2010, 09:59 PM

Can anybody point me to a formula for calculating the Zout of a differential pair?

Thanks,
Marty

woody · 8th January 2010, 10:37 PM

I believe it is simply twice what each side is.

ja2dhc · 8th January 2010, 11:07 PM

Quote:

Originally Posted by woody

I believe it is simply twice what each side is.

The above is correct if impedance between Out1 and Out2.

Between each Out and GND is given by following formula.

Zout1=RL1//(rp1+rp2+RL2), Zout2=RL2//(rp2+rp1+RL1)

martyh · 8th January 2010, 11:29 PM

Thanks to both of you. I had read Rp || Rp which didn’t seem right.

8th January 2010, 09:59 PM	#1
martyh diyAudio Member Join Date: Feb 2004 Location: Wisconsin	Formula for Zout of diff pair Can anybody point me to a formula for calculating the Zout of a differential pair? Thanks, Marty

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8th January 2010, 10:37 PM	#2
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	I believe it is simply twice what each side is.

8th January 2010, 11:29 PM	#4
martyh diyAudio Member Join Date: Feb 2004 Location: Wisconsin	Thanks to both of you. I had read Rp \|\| Rp which didn’t seem right.

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