We tested the camera can work in 2MHz, so we will go for it.
Thank you for your detailed explanation and quick reply.

Hello everyone, We are interfacing an IR camera with the ESP32-C3-DevKitM-1. Because the camera needs a 3MHz clock to drive so we used LEDC to generate a 3MHz PWM signal with 50% duty cycle. But we found out that the negative edge of PWM signal is glittering: PWM3MHz.PNG May we have any suggestions ...