Hi All, I want to convert a 500mv amplitude messed up pulse to a TTL pulse.
Please suggest me some good circuit.
thanks
karthick

 

My inclination is to use an amp followed by a schmitt trigger.

Check this thread out and see if it applies.

http://forum.allaboutcircuits.com/showthread.php?t=11530

 

Bill's suggestion would certainly work.

You could also use a TLV7211 which is a single CMOS comparator that has rail-to-rail inputs and push-pull outputs that would run on a single 5v supply.

For a voltage reference from a 5v supply, you could use a 1.5k current limiter resistor in series with a couple of forward-biased 1N5817 Schottky rectifier diodes to give you around a 270mV reference for the - input, and put your signal on the + input. If you wanted some hysteresis, put a 1k resistor between your signal and the + input, and connect a 1meg resistor from the output to the input.