# Can the output impedance on af op-amp be set to 50 ohm regardless of frequency?

I want to make a circuit with an output impedance of 50 ohms.

I am dealing with negative photomultiplier tube pulses that in 50 ohm load look like in the picture below:

I want to use the pulses to trigger the one shot sub-circuit described here which uses positive signals:

I understand that I must use a simple sub-circuit with an inverting fast operational amplifier.

Is it possible to make the op-amp sub circuit have an $$\ Z_{out} \$$ = 50 ohm so it can drive the one shot sub-circuit?

• Andy's advice is spot on for Zo, however you can modify the one-shot to accept negative input pulses – sstobbe Apr 15 at 19:00
• @sstobbe hello and thank you for commenting , such a modification would that would be very good . Do you have any suggestion how yo modify it ? Best regards. – Suparman Sy Apr 16 at 2:15