Formula for Zout of diff pair - diyAudio
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Old 8th January 2010, 09:59 PM   #1
martyh is offline martyh  United States
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Default 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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Old 8th January 2010, 10:37 PM   #2
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I believe it is simply twice what each side is.
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Old 8th January 2010, 11:07 PM   #3
ja2dhc is offline ja2dhc  Japan
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Quote:
Originally Posted by woody View Post
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)
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Old 8th January 2010, 11:29 PM   #4
martyh is offline martyh  United States
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Thanks to both of you. I had read Rp || Rp which didnít seem right.
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