I'm working on half bridge mosfet gate driver using IR2184 and IRF540N mosfets. You can find circuit diagram and scope captures in images.
I have observed that there is a small spike (LC tank like output) at the gate of low side gate driver output whenever high-side gate driver output switches.
I can not upload 3 images due to smaller reputation but you can find all 3 images here
Figure 1, shows circuit diagram of half bridge driver and all the values are calculated from infineon application note AN-978. All the grounds i.e. microcontroller, gate driver, half bridge are common.
Figure 2, shows scope capture of half bridge driver. I observe surge on gate of low side driver output. This surge in turn reflects at microcontroller PWM output.
I have observed microcontroller PWM output without connecting it to driver and that PWM output is clean. From other posts like here I understand that length of power supply cable and all that forms a LC like circuit that causes this.
Then I implemented on breadboard and take utmost care that all the components have minimum distance between them as possible. After that amplitude of surge reduced to what you see in scope capture.
Then I connected RC snubber circuitry across D-S terminals of both the mosfets and RC of both the circuits is 100 kHz as maximum signal frequency in system is 32kHz PWM frequency. Scope capture of this has also reduced amplitude of surge further. But how to get rid of it completely?
Figure 3 shows scope capture after adding RC snubber to the system.