Styx
Active Member
I am presently trying to debug a comparator circuit someone else has designed and it is presently built around an LT1716 comparator
originally the threshold were miles off the design case and via LTspice the circuit now toggles at the desired points (~3.9 , ~3.6). The problem is, this is based upon noting the output voltage was 7.9V (as oppose to the 15V - 210mV). This part has a low output current source and thus this will be responsible for the reduction in output voltage and the change in thresholds.
What I am struggling with is how to determine the output voltage analytically rather than via simulation. I have opened up the SPICE library which comes with ltspice in an attempt to determine the equivalent output impedance but I am struggling. Presently everything aligns when the output of the LT1716 is assumed to be ~47k
Any help would be appreciated
originally the threshold were miles off the design case and via LTspice the circuit now toggles at the desired points (~3.9 , ~3.6). The problem is, this is based upon noting the output voltage was 7.9V (as oppose to the 15V - 210mV). This part has a low output current source and thus this will be responsible for the reduction in output voltage and the change in thresholds.
What I am struggling with is how to determine the output voltage analytically rather than via simulation. I have opened up the SPICE library which comes with ltspice in an attempt to determine the equivalent output impedance but I am struggling. Presently everything aligns when the output of the LT1716 is assumed to be ~47k
Any help would be appreciated
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