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From: "R. Lewis"
Subject: Re: output impedance
Date: Thu, 7 Nov 2002 19:13:32 -0000
Organization: Nextra UK
NNTP-Posting-Date: Thu, 7 Nov 2002 19:12:52 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Winfield Hill" wrote in message
> Boris wrote...
> > Mick McGrath wrote:
> >> I have learned that the output impedance of an ideal current
> >> amplifier should be infinite. How can any current flow through
> >> infinte impedance?
> > The ideal voltage is infinite also.
> Usually we're referring to current sources when making such
> a statement: an infinite resistance powered from an infinite
> voltage. But an infinity that follows ohms law, in that the
> voltage is V = IR, or I times infinity. :-) As Kevin says,
> nonsense. Hah, a simple feedback-controlled current-source
> circuit does very well in practise.
> - Win
Why do you see a difficulty with dI/dV having a particular value ?
Is ohms law limited to a particular range of values? If so what happens as
the limit is approached?
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