[SI-LIST] Re: Stable Pulse width generation
- From: "dp" <dp@xxxxxxxxxxx>
- To: adeelmk@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 10 Jun 2005 15:41:17
In a 13-bit Wilkinson ADC with gated integrator type acquisition capability
I designed about 10 years ago I was successful using a 74hct221 monoflop.
The stability does (unavoidably) depend on the passives, but if you
use C0G capacitors and reasonably low ppm temperature drift resistors
12 to 13 bit precision is quite achievable (the 221 behaves really well).
Higher stability than that is achievable (while staying practical) only by
means of a quartz oscillator and dividers - if this is an option for you.
Dimiter
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Dimiter Popoff http://www.tgi-sci.com
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-------Original Message-------
> From: "Adeel Malik" <adeelmk@xxxxxxxxxxx>
> Subject: [SI-LIST] Stable Pulse width generation
> Sent: 10 Jun 2005 14:30:11
>
> Hi All,
> In my design I have to generate a low noise pulse that
> remains high for a controlled amount of time and then stays low upon the
> application of an input trigger signal. The familiar 555 timer when used
> as a monostable multivibrator outputs a pulse with a controlled width
> when a trigger input signal is applied. The output pulse-width is
> controlled by a Resistor/ Capacitor connected across its VCC and
> Discharge pin... The width of the pulse is calculated by T
> (Pulse-width)= 1.1 x R x C. This means that a drift in the value of R or
> C either due to temperature derating, or tolerance exceeding can produce
> a variation in the width of the generated output pulse.
>
> Can someone suggest me some other stable means of generating a low-noise
> pulse with a more accurate pulse width control un-affected by the
> passive components derating or tolerance.
>
> Regards,
> Adeel Malik.
>
>
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