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Old 26th October 2012, 11:55 PM   #1
tessier is offline tessier  Canada
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Default Questions about a IV amp circuit

Hi

Here's a IV amp circuit.

How good would be this circuit ?

Can I use it for a TDA1541A dac ?

Any opinions about this IV amp circuit ?

It look like a Satri circuit.

Thanx

Paul
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File Type: gif Dac IV amp.gif (44.2 KB, 83 views)
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Old 27th October 2012, 01:43 AM   #2
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Looks rather like a discrete opamp. Probably too poor slew rate to work well as I/V - the LTP current is just 1mA that charges caps which total 20pF explicitly, plus the parasitics. That appears to top out below 50V/uS. I'd suggest something more optimized for the task - at the very least you could further degenerate the LTPs to improve the slewing. I'd go for a CFB topology myself if I were doing a discrete I/V.
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