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Question about Pass D1 I/V output stage
Question about Pass D1 I/V output stage
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Old 2nd July 2005, 02:40 PM   #1
PatPet is offline PatPet  Hong Kong
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Join Date: Apr 2004
Location: HKSAR
Default Question about Pass D1 I/V output stage


I have a DAC with parallel AD1865N-K. But I'm not sure whether the output stage will work fine or not.

The current output in each Iout pin is +/- 1mA. Therefore when I have 8 of them connected in parallel, Iout becomes +/- 8mA.

And now in the Pass output stage the IRF610 is biased at 10mA. Does that mean the limit of Iout will be 10mA? Furthermore, what shall I do if I stack 16 of them in each channel?


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Old 2nd July 2005, 06:16 PM   #2
CraigBuckingham is offline CraigBuckingham
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Join Date: Dec 2002
Location: Sydney, Australia
If IRF610 is in common gate configuration then its current will be +18mA to +2mA. If there is an I/V resistor you will need to lower its resistance by the same factor you increased the current swing by to have the same output voltage swing.
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