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Old 4th August 2009, 06:54 PM   #11
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Jan to explain
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Old 4th August 2009, 06:56 PM   #12
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Quote:
Originally posted by PMA
Jan to explain
Waiting for Jan...
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Old 4th August 2009, 07:05 PM   #13
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Old 4th August 2009, 07:58 PM   #14
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Quote:
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Blomley

Ah no, it is not about phase splitting. It is about a fast precision current comparator. It compares 2 symmetrically swinging currents with frequencies up to 1 MHz and values up to 20 mA and shows fast and precise differential between them as an infinitely amplified voltage.
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Old 4th August 2009, 08:26 PM   #15
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How about a current conveyour?
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Old 4th August 2009, 08:38 PM   #16
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Quote:
Originally posted by darkfenriz
How about a current conveyour?
What is it?
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Old 4th August 2009, 08:51 PM   #17
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Peter Current Conveyour

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Old 4th August 2009, 08:55 PM   #18
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What about this one?

Click the image to open in full size.
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Old 4th August 2009, 09:02 PM   #19
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seriously current conveyor is a similar concept to operational amplifier, but it has two low impedance inputs and a high impedance output, nomen omen.
It has a intrisic speed, because there is no voltage gain inside.

Your patterns may work, but every transimpedance stage made around a resistor in negative feedback loop may have problems with stability.
It's because from 'voltage' point of view, input impedance is infinite, and resistance in feedbackloop is given, so the 'voltage' gain is below 1, which is something most opamps hate.
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Old 4th August 2009, 09:32 PM   #20
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darkfenriz,
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It has a intrisic speed, because there is no voltage gain inside.
Excuse me, but you probably meant to say "no current gain".
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