Hi,

Can someone suggest me real Operational amplifier with as small as possible Jitter?

My OP works in comparator mode and I need low jitter Operational Amplifier so the edge deviation would be as small as possible.

Thnaks

 

Hi,

Can someone suggest me real Operational amplifier with as small as possible Jitter?

My OP works in comparator mode and I need low jitter Operational Amplifier so the edge deviation would be as small as possible.

Thnaks

Op amps make inferior comparators. You will get lower jitter from a real high speed comparator.
What is your application?

 

Are you saying you get jitter when the output switches from one state to the other? If so, you need a hysteresis resistor added between the output and the (+) input. Usually, it's a high value, like 100k.
Because of their internal compensating capacitor op-amp comparators are very slow. An LM339 is a very common comparator chip. Beware that it has an open collector output requiring an external pull up resistor. Also note that its output current capacity is low.

 

My application is Asynchronous Sigma Delta modulator with hysteresis:

Where I use AD8056 operation amplifiers with slew rate 1400V/us.

So I want jitter effect as small as it could be, becouse ASDM resolution depends on switch time accuracy.

 

This should help:

http://www.analog.com/library/analogDialogue/archives/34-07/comparators/

I'd still use a good comparator.

 

This should help:

http://www.analog.com/library/analogDialogue/archives/34-07/comparators/

I'd still use a good comparator.

I agree. A high slew rate, high bandwidth op amp still may not have symmetrical propagation delay when operated as a comparator, and the AD8056 does not have good output logic levels.

 

Possibly a discrete Schmitt trigger? - http://www.solarbotics.net/bftgu/tutorials_schmitt.html