Looking for a high speed THT comparator >1MHz

[SalinsLV]

Hello!

I am looking for a THT comparator that can compare vref(0V) with >1Mhz signals and give an output that looks like this:

Circuit looks like this:

Falstad simulation code:
1MHz comparator simulation.txt

So far I have used op-amps and comparators that i have - LM393N, LM393P, LM311P, LM358P, LM386N-1 and AD8055A.
At lower frequencies they work almost identical to the simulation. One exception is AD8055A which outputs distorted square wave with roughly 1.24V DC offset that i can't seem to get rid of:

(blue input, yellow output of AD8055A)

Another screenshot from the AD8055A output:


 Resistor to ground only increases the current draw and a capacitor at the output messes with the rise/fall times making the square wave with slow rising edges. Main reason why i bought AD8055A was that I thought that it will compare the inputs at even 300MHz (as mentioned in datasheet) but i was wrong.
At higher frequencies, every op-amp and comparator that i have gives an output similar to this:

or even worse:


Does anyone know a comparator that could complete the function that i described?

[davekni]

TLV3501 is the part I use for high-speed comparison.  The optimum part for your needs depends on how much delay you can tolerate, input and output voltages etc.  I think TLV3501 will be close to your ideal.  The UD2.7 uses TL3116, another option to consider.  These are SMT, however.

Make sure the comparitor - input is slightly above 0V if your input signal (+ input) goes down to 0V.  No comparitor works with zero overdrive voltage.  Also need good ECB layout to avoid parasitic oscillation.  Perhaps that is why new high-speed comparitors are rarely THT.  SMT allows lower parasitic lead inductances.

[Twospoons]

Some of those scope traces look like you are trying to drive the comparator input below its negative rail (evidence: soft clipping).  That would explain the weird output from the AD8055. Post a schematic of what you are doing.
Also I wouldn't bother with a simulation unless you are using a proper spice model of the comparator/opamp - try either LTSpice or Simetrix, they will give you much more accurate results. Both are free, Simetrix is node limited but is my personal favorite due to ease of use and simulation speed.