Other Parts Discussed in Thread: LM2903
Tool/software:
Hi Expert,
I encountered a problem while using the LM2903 TINA simulation model recently. The positive input is a fixed voltage, while the negative input is a varying voltage. I found that the time it takes for the comparator's output to flip after the negative input reaches the threshold (the positive input voltage) varies. The time is related to the circuit at the negative input; the more complex the circuit, the longer the response time. For example, if the negative input circuit is an RC circuit and the voltage is divided by a resistor from the power supply, the response time will be longer. I'm not sure what causes this.
This is the simulation waveform when the negative input is complex circuit, rising from 0V to 2.5V where the comparator flips, taking 41.96us.
This is the simulation waveform when the negative input is simple circuit, rising from 0V to 2.5V where the comparator flips, taking 2.66us.
Thanks a lot!
Andy
