PULSE WIDTH MODULATION BASED REAL-TIME CLOCK SYSTEM AND ASSOCIATED METHOD

摘要

A pulse width modulation (PWM) based Real-time clock (RTC) system (200) includes a voltage regulator circuit (202), a capacitor (208), an RTC circuit (204) and an on-off logic (210). The voltage regulator circuit (202) is arranged to generate a regulated voltage to a connection node when enabled; the capacitor (208) is coupled to the connection node; the RTC circuit (204) is coupled to the connection node; and the on-off logic (210) is coupled to the voltage regulator circuit (204) and arranged to alternately enable and disable the voltage regulator circuit (202).