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COD and output caps (opamp IV)
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HeadSh0T  
#1 Posted : Friday, February 29, 2008 2:22:52 PM(UTC)
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If I use a TXD as an active I/V stage, do I still need output caps on the COD?
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HeadSh0T  
#2 Posted : Wednesday, March 5, 2008 8:56:38 AM(UTC)
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Anybody?
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Russ White  
#3 Posted : Wednesday, March 5, 2008 9:42:29 AM(UTC)
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Sorry I missed this post till now.

You should short the output caps and omit the passive I/V resistors(R1-R4) when using TXD or IVY for active I/V.

Cheers!
Russ
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HeadSh0T  
#4 Posted : Wednesday, March 5, 2008 11:24:03 AM(UTC)
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So active I/V removes DC offset?
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Brian Donegan  
#5 Posted : Wednesday, March 5, 2008 11:39:56 AM(UTC)
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Yup
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Russ White  
#6 Posted : Wednesday, March 5, 2008 11:41:05 AM(UTC)
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Yes, thats one the really cool thing about the TXD setup for I/V and the IVY modules. They utilize the THS41xx amplifiers which have a common mode output voltage node. That node is set to 0V.

Cheers!
Russ
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