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From: "Trevor Wilson"
References: <firstname.lastname@example.org> <email@example.com> <3DA9D792.1090708@BOGUS.earthlink.net>
Subject: Re: easy fast rise time pulse generator?
Date: Mon, 14 Oct 2002 07:37:55 +1000
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"Chris Carlen" wrote in message
> Trevor Wilson wrote:
> > "Larry Gagnon" wrote in message
> > news:firstname.lastname@example.org...
> >>I require a fast rise time pulse generator to calibrate the vertical
> >>amplifier pulse response of my HP1722B oscilloscope. Obviously the
> >>pulse marks do not need to be of high frequency train because the
> >>scope is calibrated for this at a time/div of only 10 microseconds.
> >>Could anyone suggest a simple circuit that would give me a fast rise
> >>pulse? Any help greatly appreciated.
> > **A 555 driving a Maxim line driver IC (I can't recall the part number)
> > give you 50nS rise time. Maybe less, with careful layout (I managed
> > I'll post the Maxim IC number later today. It comes in an 8 pin
> I hate to tell you this, but that's not really very fast. Sub 1ns is
> what most folks think of when someone comes along asking for "fast
**No argument from me. However, the waveform produced is nice and square and
is cheap and easy to implement.
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