Design of a Counter-Based DPWM Using RC Charge

Conventional counter-based digital PWM (DPWM) has simple hardware architecture to generate the PWM pulse, however, the resolution of the counter-based DPWM is directly proportional to its input reference clock, and thus the higher clock frequency is required, which means higher dynamic power consumption and noise interference may be incurred. In this paper, by the design approach of RC charge, the proposed DPWM device can extend its resolution without increasing the reference clock frequency. Moreover, this DPWM scheme with resolution extension also can reduce the hardware complexity and the impact caused by capacitance error compared with the conventional DPWM.