Electronics > Beginners
Help with comparator in LTspice? Ensuring 0V output?
bluebreak:
Trying to build a simple comparator based on the LT1011 in LTspice that will output an arbitrary voltage (in this case, 0.5V) when the input signal is under an arbitrary voltage (also 0.5V here).
The comparator seems to pull up the voltage fine, but when the input is above the threshold it appears to output about 150mv in the simulation. Is there a simple way of pulling this down as close to 0V as possible?
Ian.M:
What do you expect from a comparator with a BJT open collector output? Its ability to pull low is limited by its Vce_sat. If you wanted it to go to 0V, you'd need to find a MOSFET output one and a LTspice model for it
T3sl4co1l:
What are you actually doing?
For example, if this is a reference voltage for another circuit, consider using analog switches (don't forget to include their resistance!) with a reference voltage divider and/or voltage buffer.
Tim
floobydust:
Your -V source seems backwards in the schematic/sim
bluebreak:
I'm trying to simulate a gate/trigger for an analog synth, providing a control voltage out if input is below a threshold.
So analog switch (mosfet) driven from the comparator is a better way to go?
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