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From: "laurence cope"
Subject: Re: Comparator snap on-off ??
Date: Tue, 15 Oct 2002 13:08:41 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Tue, 15 Oct 2002 13:08:41 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
also look up oscillation
Some comparators are very much prone to oscillation, if you are using
hysteresis feedback, a capacitor on the input will stop this.
"frank" wrote in message
> I am working on a comparator circuit that is used as a window
> comparator to determine if a temperature is within spec. The reference
> voltages to the comparators are only 300 mV apart. Comparators are
> AD790 types. Example:
> Nominal temp input voltage: 1.5 V
> Reference High level : 1.65 V
> Reference Low level : 1.35 V
> The comparator signal is monitored with an ADC and also drives a pair
> of status LED's for the operator to monitor. It would be desirable for
> the LED's to "snap" on or off as the levels are reached. As it is now,
> the LED's slowly turn on and off as the level is being detected. The
> output of the comparators drive an Allegro 2981 relay driver to turn
> the LED's on. Any ideas/suggestions? Let me know if more details are
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