[Test-Equipment] Need to shift pulse up 5V

[KA4INM]

On 05/01/2015 12:37 AM, Barry wrote:

> I have a situation where a clock signal is pulsed to 0V from a normally -5V signal level.  I would like to have that same waveform shifted +5V (e.g. the pulse would go from 0V to +5V instead of -5V to 0V).
>
> Is there a convenient way to do this?  I thought this might be a somewhat common problem and there would be a selection of "level shifting" chips but I'm not finding that to be true.  I assume that if there's no dedicated IC for this kind of thing, then perhaps a simple single transistor circuit might do the trick but thought I'd ask first if there are any off-the-shelf "standard" solutions to this.

   A resistor to + 5 Volts (or more) and a 5 Volt Zener diode (commonly
5.1 Volts) in series to the old data line will shift the the common
connection of the two up by the value of the Zener diode.
A capacitor across the Zener diode might speed it up.)
   A transistor and resistors can also do it and:
   An Op-Amp can be arraigned to do it. (might be slow)
Lever shifting IC's do exist, but they may require Voltages that you do
not have available and they may be extinct by now.
They are part of the ECL family of ICs.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.