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From: Paul Burridge
Subject: Re: SPICE simulation goes awry?
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <3DFB4A18.firstname.lastname@example.org>
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Date: Sat, 14 Dec 2002 15:20:16 +0000
NNTP-Posting-Date: Sat, 14 Dec 2002 16:48:37 GMT
Organization: ntlworld News Service
On Sat, 14 Dec 2002 15:12:34 GMT, Roy McCammon
>There are no ideal current sources and there are no
>ideal voltage sources, but the ideal sources are
>convenient for building models. Some circuits are more
>easily modeled with current sources. There are many
>ways to implement approximate current sources. In this
>case, the designer is basically saying that he knows a
>suitable way to pull 1mA out of the emitter such that the
>emitter current will be close enough to a constant 1mA
>under the actual circuit operating conditions.
I'm still baffled. Why wouldn't any designer just work out biasing
arrangements with suitable resistors to derive 1mA Ie from the power
supply? You don't see current sources shown in practical designs for
any oscillator so I don't see how using one in a simulation is going
to make practical development any easier.
"What is now proved was once only imagin'd"
- William Blake, 1793
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