dedjazzgadgetz
New Member
Hello everyone !
In a design I'm working on right now, 3 comparators are used to detect (going "high") whenever their input almost "touch" Vdd (my circuit runs on +/- 7 volts). It just so happens I have 3 unused CD4069 inverters in there, as well...
Just for the sake of elegance & streamlining, is it possible to coax an inverter ("tweak" its threshold level using say, a resistor network, a zener diode... IDK) to act as a comparator (inverting, that is), in the process getting rid of my quad comparator chip ?
In other words: the inverters would be required to output "high" only this time, when their input just shy of Vss.
A quote off the net "sort-of" implied such a possibility (wishful thinking, I know...): "When you short-circuit the output to the input of a CMOS inverter, you are making a comparator."
(I think it was off edaboard, or something... I searched a lot, including this site. Please forgive me if I overlooked anything...
)
Thank you for reading on and pointing me in the right direction !
Joël
In a design I'm working on right now, 3 comparators are used to detect (going "high") whenever their input almost "touch" Vdd (my circuit runs on +/- 7 volts). It just so happens I have 3 unused CD4069 inverters in there, as well...
Just for the sake of elegance & streamlining, is it possible to coax an inverter ("tweak" its threshold level using say, a resistor network, a zener diode... IDK) to act as a comparator (inverting, that is), in the process getting rid of my quad comparator chip ?
In other words: the inverters would be required to output "high" only this time, when their input just shy of Vss.
A quote off the net "sort-of" implied such a possibility (wishful thinking, I know...): "When you short-circuit the output to the input of a CMOS inverter, you are making a comparator."
Thank you for reading on and pointing me in the right direction !
Joël