It made a comparator with ad8009 element. Configured as follows
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The signal fell to negative and held the reference to negative volts.
We would like to :
Signal information.
Amplitude : 0V~-3V
Rising frequency : 50Mhz
We use ad8009 as a delay in addition to a comparator. (In the entire circuit)
However, many offsets occur. (over 3.8V / I judge that the amp is over stress)
We decided it was because we were using a lot of amp. So we've only tried one channel.
And the logic coming down is too long.(Falling time about 10ms )
We are planning to use a low current supply of ad8011 instead of ad8009.
Here's the question. Using a lot of amp to supply a lot of current can lead to a lot of offset to the output? I wonder why. All the voltage is parallel.
The second question. Can we solve the problem of noise or falling time by replacing ad8009 with ad8011? This question is linked to a SiPM . question that I have previously done.
Or, if you can't use the above amplifier as a comparator, can you recommend it? We can not use the comparator IC because the system above is already made of PCB.
Hi REPID,
AD8009 is a current feedback amplifier and it is not a good idea to use these kind of amplifiers for this specific application, unlike those that are Voltage feedback. The closest replacement you could get, in terms of BW and Slew Rate, is the AD8045.
Regards,
Jino
Thank you.