A CMOS LED print head driver with compensation circuits

In this paper, a CMOS LED print head driver with compensation circuits is newly proposed. The proposed chip adopts dynamic pulse width modulation (DPWM) to make pulse width more variable. Due to process and fabrication variation, two compensation circuits are proposed. One is to perform the chip compensation, and the other is to do the pixel compensation. Based upon the device parameters of 0.5 µm 1P2M CMOS technology with 3.3 V power supply, all the functions and performance of the proposed CMOS LED print head driver with compensation circuits are successfully tested and proven through SPICE simulations. The area including ESD I/O pads is 2000 × 2000 µm
²
. The proposed chip is suitable for LED printers.