Hello! I`ve got some problems with fast MOSFET switching. My design is high-speed square-wave pulse generator with nanosecond rise and fall times, where MOSFET acts as a switch. I`ve searched several fast-switching FETs, and found that IRF630N is really suitable for my design. It has good characteristics (Turn-On Delay Time 7.9ns, Rise Time 14ns, Turn-Off Delay Time 27ns, Fall Time 15ns), then I decided to drive FET with IR4427. External signal generator parameters 0-20kHz with 100ns rise and fall times. When I connected generator with a MOSFET driver, I`ve got better pulse response, IR4426`s output showed 50ns rise and fall times. I thought that it is very good and my problem is solved until I connected IRF630N to the output of the driver through 10Ohm resistor.
I found it terrible, there were so much unwanted oscillations through the load.
What can be the problem? Circuit and oscilloscope snapshots attached. Thanks..