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From: Uwe Bonnes
Subject: Re: How do I feed 0v/1v logic levels to CMOS?
Date: Sat, 12 Oct 2002 12:07:07 +0000 (UTC)
Organization: TU Darmstadt
Sender: Uwe Bonnes
NNTP-Posting-Date: Sat, 12 Oct 2002 12:07:07 +0000 (UTC)
User-Agent: tin/1.4.4-20000803 ("Vet for the Insane") (UNIX) (Linux/2.4.18-4GB-SMP (i686))
: Can anyone please help me with (I hope) a simple problem.
: I have a temperature monitoring device with 1.5v battery supply. It outputs
: logic levels of 0v (low) and 1.5v (high).
: I want to connect this to a CMOS circuit I'm constructing running of 0v-12v
: supply (on a PC). The CMOS circuit is a simple logic one using 4001 type
: transistors etc.
: I know I need some kind of voltage shifter to up the high level to at
: least 5v
: or so. I'm considering using single-supply op-amp as a voltage comparator.
: Can anyone suggest a simple way of doing this? Any help, references, sources
: would be very much appreciated.
Generate a voltage of about 0.75 Volt and feed it to the negative input of
comparators. Feed the 1.5 Volt input signal to the positive input and use
the CMOS supply also as supply for the comparators. If you need fast signal
translation, use Push/Pull Comparators.
Uwe Bonnes email@example.com
Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
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