signal integrity

Hello, I am trying to make a simple inverter pcb but my output is a square wave instead of the expected spwm. I suspect that some capacitance or inductance is built up due to the pcb layers that alters the gate signal. My traces going to the mosfet gates are quite wide (1.5mm) and their length...

New to PCB Design and layout. While routing bypass caps, I instinctively give each bypass cap its own via to the ground plane. What would be the disadvantages of having two (or more) bypass caps share the same ground via? I suspect the consequences are more apparent in high-speed and/or high...