It takes some time to rise. Look in at the speed on the Datasheets, volts/microsecond is the common unit of measurement. The better question is, how fast do you need it to change? Most op amps will go from 0 to a logic high in 1 microsecond. Many will do it in 0.1 microseconds and a few in 0.01 microseconds.Hi guys.
I need an opamp as a comparator that would be able to switch directly from high level to low level or vice versa, without changing gradually. Refer to the below picture.
Which micro or nano power op amp do you recommend?
You seem to interpreted the OPs graph as a time based graph rather than an input voltage graph, as yet the OP hasn't really said time is an issue, though that might well be what he was really asking about, who knows only the OP himself.It takes some time to rise. Look in at the speed on the Datasheets, volts/microsecond is the common unit of measurement. The better question is, how fast do you need it to change? Most op amps will go from 0 to a logic high in 1 microsecond. Many will do it in 0.1 microseconds and a few in 0.01 microseconds.
If you need micropower, the speed is generally slower 10 microseconds for the transition or less. There are a few good, modern micropower op amps that are faster.
Most importantly, the graphs you show appear slow but no timescale. Don't let the lack of scale fool you that an op amp is slow. Note that a microsecond is one millionth of a second (0.000001 seconds).
Let us know what you are doing with it.
Again with the time. All the OP needs is a very high gain amp to match his 'ideal' he hasn't said anything about slew rate or switching time.All good answers.
@OP - You have to specify a time scale for your switching times otherwise there is no way to compare. There is no such thing as zero switching time.
@OP - Choose a comparator instead of an opamp. And read the datasheets. Every opamp and comparator datasheet will quote switching times, rising and falling, under various conditions.
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