I´m designing a LVCMOS to NIM signal translator, requirements of the circuit are
Input frequency from 10KHz to 40Mhz
Input 3.3V LVCMOS
Output logic "0" 0mA or 0V; logic "1" 18mA or 1V
I decide to use AD8009 because it declares a 5500V/us slew rate but during simulations I found a delay of approx 1ns and some signal distortion, I´d like to have a delay between input and output as little as possible ( 100ps or less)
How can I improve the response?
In simulation green is input, red is output current and blue voltage current
Thanks for your help
Hello,
I do agree with KirV that what you seen is an overshoot.
I have tried your circuit only that I have reduced the resistor values by factor of 4.
I only retain the two 100 ohms and the 50 ohms near the output.
I were able to reduce the propagation delay from ~600pS to ~190pS.
Also, I have tried to simplify your circuit.
The 1st stage is inverter/attenuator and the 2nd stage is inverter/buffer.
I used divider instead and feed into the buffer.
I were able to obtain ~135pS prop delay.
Hope this helps.
Dear Fdelaram
Thank you so much for your help, the improvement in delay is huge and that´s wath worried me the most!
Best regards
Dennis